Add and subtract 6-digit and 5-digit numbers without regrouping worksheet is a great way to help learners become fluent with the concept of addition and subtraction. The opposite operation to addition is subtraction and vice versa. In this worksheet, students apply this relationship and their knowledge of basic addition and subtraction facts to add and subtract 6-digit and 5-digit numbers without regrouping. 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.