CONTENT TYPE
SUBJECT
- Number Sense (76)
- Addition (90)
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Subtraction
(81)
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Subtract With Pictures
(6)
- 2-Digit Subtraction (15)
- 3-Digit Subtraction (52)
- 4-Digit Subtraction (12)
- Multiplication (141)
- Multiplication Strategies (52)
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Multiplication With Equal Groups
(16)
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Multiplication With Arrays
(20)
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Multiplication Sentences
(11)
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Multiplication On A Number Line
(11)
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Repeated Addition To Multiply
(17)
- Times Tables (82)
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Multiplication By 2
(10)
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Multiplication By 3
(10)
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Multiplication By 4
(9)
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Multiplication By 5
(10)
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Multiplication By 6
(9)
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Multiplication By 7
(8)
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Multiplication By 8
(8)
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Multiplication By 9
(9)
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Multiplication By 10
(5)
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Multiplication Properties
(13)
- Division (72)
- Fractions (77)
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Fractions Using Models
(27)
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Fractions On A Number Line
(10)
- Compare Fractions (14)
- Equivalent Fractions (14)
- Fractions Operations (9)
- Geometry (13)
- Data Handling (28)
- Measurement (63)
- Time (9)
- Money (21)
- Algebra (12)
- Word Problems (32)
Subtract With Pictures Skills
View all 6 games-
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Subtract With PicturesUse Model to Subtract
Shine bright in the math world by learning how to use models to subtract.
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Subtract With PicturesUse Model to Subtract 1-Digit Number
Take the first step towards building your math castle by using models to subtract 1-digit numbers.
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Subtract With PicturesSubtract Using Base-10 Blocks
Add more arrows to your child’s math quiver by subtracting using base-10 blocks.
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Subtract With PicturesUse Models to Subtract
Dive deep into the world of math by using models to subtract.
2-Digit Subtraction Skills
View all 15 games-
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2-Digit Subtraction Without RegroupingFind the Difference by Subtracting Multiples of 10
Have your own math-themed party by learning to find the difference by subtracting multiples of 10.
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2-Digit Subtraction Without RegroupingTaking Away Multiples of 10
Enter the madness of math-multiverse by exploring how to take away multiples of 10.
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2-Digit Subtraction Without RegroupingSubtract Using Place Value Chart
Let your child see the world through math-colored shades by subtracting using a place value chart.
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2-Digit Subtraction Without RegroupingUse Subtraction to Find the Difference
Have your own math-themed party by learning how to use subtraction to find the difference.
3-Digit Subtraction Skills
View all 52 games-
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3-Digit Subtraction Without RegroupingSubtract 10 and 100 from 3-Digit Numbers
Unearth the wisdom of mathematics by learning how to subtract 10 and 100 from 3-digit numbers.
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3-Digit Subtraction With RegroupingUse place Value to Subtract by Breaking Tens
Sharpen your subtraction skills by using place values to subtract by breaking tens.
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3-Digit Subtraction Without RegroupingFind 10 Less than a 3-Digit Number
Shine bright in the math world by learning how to find 10 less than a 3-digit number.
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3-Digit Subtraction With RegroupingSubtract by Breaking Up Tens
Enjoy the marvel of mathematics by exploring how to subtract by breaking up tens.
4-Digit Subtraction Skills
View all 12 games-
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4-Digit Subtraction Without RegroupingSubtract 2-Digit Numbers from 4-Digit Numbers Without Regrouping
Sharpen your math skills by subtracting 2-digit numbers from 4-digit numbers without regrouping.
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4-Digit Subtraction Without RegroupingFluently Subtract 2-Digit From 4-Digit Numbers
Enjoy the marvel of mathematics by exploring how to fluently subtract 2-digit from 4-digit numbers.
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4-Digit Subtraction Without RegroupingSubtract 3-Digit Numbers from 4-Digit Numbers Without Regrouping
Subtract 3-digit numbers from 4-digit numbers without regrouping.
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4-Digit Subtraction Without RegroupingSubtract 2-Digit From 4-Digit Numbers Using Model
Enjoy the marvel of mathematics by exploring to subtract 2-digit from 4-digit numbers using models.
All Subtraction Skills
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3-Digit SubtractionSolve Scenarios with 'Difference Unknown'
Shine bright in the math world by learning how to solve scenarios with 'Difference Unknown'.
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3-Digit SubtractionSolve Subtraction Word Problems
Enjoy the marvel of mathematics by exploring how to solve subtraction word problems.
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Subtract With PicturesUse Models to Subtract 2-Digit Number
Enter the madness of math-multiverse by exploring how to use models to subtract 2-digit numbers.
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2-Digit SubtractionUse Place Value Chart to Subtract Multiples of 10
Enter the madness of math-multiverse by using place value charts to subtract multiples of 10.
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3-Digit SubtractionSubtract 10 from a 3-Digit Number
Practice the superpower of subtraction by learning how to subtract 10 from a 3-digit number.
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4-Digit SubtractionSubtract 2-Digit From 4-Digit Numbers and Match
Enjoy the marvel of math-multiverse by exploring to subtract 2-digit from 4-digit numbers and match.
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Subtract With PicturesUse Models to Subtract 3-Digit Numbers
Learn to solve math problems by using models to subtract 3-digit numbers.
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2-Digit SubtractionSubtract Multiples of 10
Let your child see the world through math-colored shades by subtracting multiples of 10.
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3-Digit SubtractionSubtracting 10 from 3-Digit Numbers
Enjoy the marvel of mathematics by exploring how to subtract 10 from 3-digit numbers.
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4-Digit SubtractionSubtract 3-Digit From 4-Digit Numbers Using Model
Use your math skills to subtract 3-digit from 4-digit numbers using models.
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2-Digit SubtractionSubtract Multiples of 10 from 2-Digit Numbers
Use your subtraction skills to subtract multiples of 10 from 2-digit numbers.
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3-Digit SubtractionUse Place Value Chart to Subtract 1-Digit Number
Apply your math skills to use place value charts to subtract 1-digit numbers.
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4-Digit SubtractionFluently Subtract 3-Digit From 4-Digit Numbers
Learn to solve math problems by fluently subtracting 3-digit from 4-digit numbers.
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2-Digit SubtractionFind the Missing Number in Subtraction Sentence
Unearth the wisdom of mathematics by learning to find the missing number in subtraction sentences.
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3-Digit SubtractionSubtract 1-Digit Number from 3-Digit Number
Take a deep dive into the world of math by subtracting 1-digit numbers from 3-digit numbers.
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4-Digit SubtractionSubtract 3-Digit From 4-Digit Numbers and Match
Practice the superpower of math by learning how to subtract 3-digit from 4-digit numbers and match.
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2-Digit SubtractionUse Place Value Chart to Subtract
Learn to solve math problems by using place value charts to subtract.
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3-Digit SubtractionSubtracting 1-Digit Number from 3-Digit Number
Enjoy the marvel of math-multiverse by exploring to subtract 1-digit numbers from 3-digit numbers.
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4-Digit SubtractionSubtract Two 4-Digit Numbers Using Model
Learn to solve math problems by subtracting two 4-digit numbers using models.
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2-Digit SubtractionSubtract 2-Digit Numbers
Begin the exciting journey of becoming a math wizard by learning how to subtract 2-digit numbers.
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3-Digit SubtractionUse Subtraction to Complete the Equations
Take a deep dive into the world of math by using subtraction to complete the equations.
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4-Digit SubtractionRegroup to Subtract Two 4-Digit Numbers
Learn to solve math problems by regrouping to subtract two 4-digit numbers.
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2-Digit SubtractionSubtract 2-Digit Numbers Without Regrouping
Unearth the wisdom of mathematics by learning how to subtract 2-digit numbers without regrouping.
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3-Digit SubtractionUse Place Value Chart to Subtract 2-Digit Number
Enjoy the marvel of math-multiverse by using the place value chart to subtract 2-digit numbers.
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4-Digit SubtractionFluently Subtract Two 4-Digit Numbers
Help your child take flight by learning how to fluently subtract two 4-digit numbers.
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2-Digit SubtractionSubtract to Complete the Subtraction Sentence
Practice the superpower of math by learning how to subtract to complete the subtraction sentence.
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3-Digit SubtractionSubtract 2-Digit Number from 3-Digit Number
Enter the madness of math-multiverse by exploring to subtract 2-digit numbers from 3-digit numbers.
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4-Digit SubtractionSubtract Two 4-Digit Numbers and Match
Enter the madness of math-multiverse by exploring how to subtract two 4-digit numbers and match.
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3-Digit SubtractionSubtracting 2-Digit Number from 3-Digit Number
Dive deep into the world of math by subtracting 2-digit numbers from 3-digit numbers.
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3-Digit SubtractionSubtract 2-Digit Numbers to Complete the Equations
Add more arrows to your child’s math quiver by subtracting 2-digit numbers to complete the equation.
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3-Digit SubtractionUse Place Value Chart to Subtract 3-Digit Numbers
Enjoy the marvel of mathematics by using place value charts to subtract 3-digit numbers.
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3-Digit SubtractionSubtract 3-Digit Numbers
Learn to solve math problems by subtracting 3-digit numbers.
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3-Digit SubtractionSubtracting 3-Digit Numbers
Take a deep dive into the world of math by subtracting 3-digit numbers.
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3-Digit SubtractionSubtract 3-Digit Numbers to Complete the Equations
Subtract 3-digit numbers to complete the equations.
Addition and Subtraction as Inverse Operations
Addition and subtraction are called inverse operations as one is the mathematical ‘opposite’ of the other. Hence, they should be taught parallelly, alongside each other rather than as two separate entities. It is essential that children are taught to appreciate and make use of this mathematical relationship when developing and using mental calculation strategies. By comparing the different conceptual structures for addition and subtraction learnt so far, we can clearly see that each addition model has a corresponding subtraction model as its inverse:
To solve add and subtract math word problems care must also be taken in knowing well not just the addition and subtraction definition but also the terminology. Here is a list of terms curated to help solve math problems related to addition and subtraction.
For addition: plus, add, sum, total, together, addition, increase by, more, additional
For subtraction: minus, subtract from, subtraction, Less, difference, decrease by, take away, deduct
Requirements for Mental Addition and Subtraction Strategies
Place Value of Digits in any Number
Sound understanding of the aspects of place value system is utmost important for children to achieve success in mental addition and subtraction tasks. It is therefore important that children can partition numbers or decompose numbers into their constituents. This is possible when children can recognize the value of the digits within the numbers, thus 53 = 50 + 3; 527 = 500 + 20 + 7 and, at later stages, they should be able to understand the same for decimals. For example, 9·23 = 9 + 0·2 + 0·03.
Comparison of Numbers
Children will also need familiarity with the relative sizes of numbers. They should recall this from all the ordering activities in place value system
Relationship between Addition and Subtraction
The inverse relationship between addition and subtraction should also be clear to kids as knowing strategies for addition will help them unlock the subtraction strategies automatically.
Some Mental Strategies for Addition and Subtraction
1. Rearranging Numbers
Rearrange the numbers such that the larger number is put first when adding using the commutative law. For example, 6 + 14, is more easily tackled as 14 + 6.
2. Using Repeated Operations
Repeated subtraction is easier to do when subtracting a large number.
For example, subtracting 300 by subtracting 100 three times.
3. Compensation or Adjustment
At times, it is easier to calculate by adjusting the numbers a little. For example, calculating with 10 is easier than calculating with 9. Calculating 43 + 19 by working out 43 + 20 and then subtracting 1 is a much more efficient way of solving the problem.
4. Using Near Doubles or Halves
When the numbers involved in the math problem are consecutive numbers.
For example, calculating 18 + 17 as ‘double 17 and add 1’ or ‘double 18 and subtract 1’
Or calculating 24 − 13 as (24 − 12) – 1
5. Partitioning
Decomposing or partition a number is sometimes more efficient.
For example, 27 + 34 = (20 + 30) + (7 + 4) = 50 + 11 = 61
or 27 + 34 = (20 + 30) + 7 + 4 = 50 + 7 + 4 = 57 + 4 = 61
6. Bridging to the next Multiple of 10 or 100
For example, calculating 238 + 17 by splitting 17 into 2 + 15.
So, 238 + 17 = (238 + 2) + 15 = 240 + 15 = 255
7. Using Inverse Relationships
We know addition and subtraction are inversely related so subtractive problems can be made additive. For example, calculating 100 − 70 by knowing that 70 + 30 = 100 and that addition and subtraction are inverse operations.
8. Rounding (to approximating answers)
For example, to solve 24 + 67, round of 24 to 20, 67 to 70 and then add 20 + 70 = 90
This approach is mostly used in multiple choice answers where knowing the approximate answer also works.
9. Using Equivalences
Equivalence relation may be used in some cases.
For example, calculating 101 − 35 by noting that this is equivalent to calculating 100 – 34 or calculating 5 + 8 by noting that this is equivalent to 5 + 10 - 2 = 15 - 3 = 13
Progression in Written Methods for Subtraction
By this grade students are already well versed with double digit subtraction with regrouping and without regrouping. In 3rd grade children should be equipped with four digits and three digit subtraction with regrouping. Following methods can be used to define subtraction and extend their knowledge of two digit subtraction with regrouping to subtract integers, decimals, mixed numbers and fractions. Time subtraction, vector subtraction and matrix subtraction will also be done in a similar way in later stages.
Methods for Subtraction
Counting up from the smaller to the larger number
This method combines the use of complementary addition with the use of number line.
Compensation ( Take too much, add back)
To solve subtraction problems using this method first subtract too much and then add back whatever extra was subtracted from the minuend.
For example, 783-356
Expanded form of Standard Algorithm
This method is used when some of the digits in the first number are smaller than the corresponding digits in the second number. This makes the use of decomposition necessary.
1. by decomposition of tens into ones (using the exchange 1 ten = 10 ones)
2. decomposition of hundreds into tens (using the exchange 1 hundred = 10 tens)
3. decomposition of hundreds into tens and then tens into ones
This algorithm can be modeled using Dienes’ base 10 apparatus as follows:
Let us look at an example of subtraction 243-179
Step 1: Partition the first number into hundreds, tens and ones: 243 = 200 + 40 + 3. Place the corresponding Dienes' blocks in the relevant columns.
Step 2: Partition the second number into hundreds, tens and ones:179 = 100 + 70 + 9. A decision needs to be made at this point as to whether the subtraction of individual columns is immediately feasible or not. In this example, the tens and ones’ columns are not.
Step 3: One of the hundreds blocks is decomposed into 10 tens in order to make subtraction of the tens digits feasible.
However, the ones column is still infeasible so a further decomposition is necessary.
Step 4: This time, one of the tens is decomposed into 10 ones. This finally makes the subtraction column by column feasible.
Step 5: Column by column, blocks equivalent to the values of the digits in the second number are removed from the first number.
Step 6: The blocks remaining from the first number after the subtraction has been performed are now placed in the answer box and their values combined to produce the answer: 60 + 4 = 64.
Contraction of Expanded Algorithm to Standard Algorithm
This method is a contracted form of the algorithm detailed above. Following are some examples for three digit subtraction with regrouping.
For example,
1. with decomposition of tens into ones (using the exchange 1 ten = 10 ones)
2. with decomposition of hundreds into tens (using the exchange 1 hundred = 10 tens)
3. with decomposition of hundreds into tens and then tens into ones
Extend to Larger Numbers
Use the same algorithms for long subtraction. For larger numbers, introduce the expanded formats first, then contract these to the standard algorithm. Once comfortable with the standard algorithm, use the same to practice adding and subtracting negative numbers worksheets then proceed to adding and subtracting integers worksheet, then practice adding and subtracting decimals worksheets and finally practice adding and subtracting mixed numbers worksheet.
Extend to Negative Numbers
Children should be taught how to add and subtract integers through learning games and activities first and then through standard algorithms. How to subtract integers or how to subtract negative numbers is easy provided students are comfortable with standard subtraction algorithm. However, the rules for adding and subtracting negative numbers must be laid down for children to be able to correctly represent all the problems of mathematics.
Extend to Decimal Numbers
Children may continue to align the right-most digits of each number vertically even when this is not appropriate for decimal numbers. It is important that children are taught, even for whole number subtractions, to align the digits of the second number underneath those of the first number according to the place value of each of the digits, that is, tens under tens, ones under ones, tenths under tenths etc. Once this concept is clear, emphasize on rules of adding and subtracting decimals. Provide kids with subtracting decimals worksheet to practice the standard algorithm well.
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How do we teach subtraction to 3rd graders?
Subtraction games for 3rd grade online can be used to teach the concept to third graders. These games help students learn new strategies to subtract multi-digit numbers. These online games also help in enhancing children’s accuracy and ability to subtract mentally, which subsequently improves their subtraction fluency.
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How can 3rd graders play games on subtraction?
Kids can play subtraction games for 3rd grade online on various devices such as smartphones, tablets, laptops, etc.
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What to teach 3rd graders in subtraction?
In grade 3, children learn how to subtract 3-digit and 4-digit numbers by using various subtraction strategies and techniques. Kids learn how to subtract numbers with regrouping and without regrouping. This enhances their subtraction skills and knowledge.
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What are some of the best fun activities on subtraction for 3rd graders?
Some of the best fun activities on subtraction for 3rd graders are: playing multi-digit subtraction jenga, reading a book on subtraction, using bundles of ice cream sticks for multi-digit subtraction, etc.
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