Add and Subtract Two 3-Digit Numbers without Regrouping: Horizontal Addition and Subtraction Worksheet

Subtraction is the opposite operation of addition and vice versa. Students use this relationship and their understanding of basic addition and subtraction facts to add and subtract two 3-digit numbers without regrouping in this worksheet. In each problem, the numbers are laid out in the horizontal format. Students should try to use different strategies involving composing and decomposing numbers to solve these problems. This will help them develop flexibility and fluency.