One More or One Less within 20: Vertical Addition and Subtraction Worksheet

This worksheet gives students an opportunity to apply the concepts of addition and subtraction to find one more or one less within 20. The concept that more implies addition and less implies subtraction is known to students. To find one more or one less within 20 in this worksheet, they must add or subtract. This worksheet is about practicing the column method in which numbers are written one on top of another. In this method, students use their place value understanding to solve the problems.