This subtraction as an unknown addend activity helps K through 2nd grade students solve subtraction within 20 by matching each fact to its addition fact card. Answer key included.

Find the missing number in equations within 20 with this adding and subtracting unknown numbers activity for 1st and 2nd grade: matching cards, a recording sheet and practice, answer key included.

This subtraction with 6-7-8-9 differences activity is a snowy card sort for kindergarten and 1st grade students. Solve each fact, sort it under its snowflake, and check with the answer key included.

This subtraction with 2-3-4-5 differences activity is a winter card sort for kindergarten and 1st grade. Children solve facts within 10, sort each card under its snowflake, and check with the answer key included.