This set of worksheets includes a mix of addition and subtraction word problems. Students are required to figured out which operation to apply given the problem context.
Practicing the operations individually helps build confidence, but an important word problem skill is figuring out which math operation is needed to solve a specific problem. The worksheets in this section combine both addition word problems and subtraction word problems on the same worksheet, so students not only need to solve the problem but they need to figure out exactly how to do it as well.
By moving into these worksheets quickly, it avoids the crutch where students learn that they always need to add or always need to subtract the two values in a problem to get the answer. This forces students to really understand the intent of the problem, not just scan the text looking for numbers.