Give your students simple two-digit numbers to practice the decomposition addition strategy! This can be used as a stand-alone activity or in conjunction with the Composing and Decomposing lesson plan.

Sharpen your single-digit addition skills with this helpful first- and second-grade worksheet!

The decomposing and composing subtraction strategy can be a handy tool for tough three-digit numbers. Use this worksheet to give your students the practice they need to nail down the concept.

Sharpen your mental math skills with this second- and third-grade compensation worksheet!