Students solve problems to figure out 10 less than numbers less than 20.

Use the mat to give students extra practice composing a 10 as they learn to add to 20.

This busy beaver is boosting his addition skills one problem at a time. Help your kid get in on the addition fun!

Does your little mathematician enjoy the pop of a good balloon? In this sheet, he'll 'pop' balloons that contain addition or subtraction problems that equal 20.

And they're off! Your mathematician will join the high-flying fun of this ski race while practicing addition and subtraction facts.

Someone help this elephant! He's lost all his color, and he doesn't know how to get it back. Use subtraction to come to the elephant's rescue!

Practice subtraction within 20 with this Halloween math workheet!

Practice subtraction within 20 with this Halloween math workheet!

This math game is a great way to help first grade learners hone their addition and subtraction skills as they race to 100.

Practice subtraction within 10 with this Halloween math workheet!

Practice subtraction within 20 with this Halloween math workheet!

Use this number line as a tool to practice adding and subtracting within 20.