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

So your child has mastered the numbers 1-10 -- what's next? How about a bright and colorful number pyramid that challenges them to tackle numbers 11-20?

Assess your students’ understanding of subtraction by having them solve subtraction problems within 20.

Add it up! Assess your students’ understanding of addition by having them solve addition problems within 20.

Learners will take on 20 one-digit addition problems in this sweet springtime worksheet.

Use this glossary with the EL Support Lesson Plan: Adding Within 20.

Gain expertise with addition sentences within 20 in this helpful math worksheet!

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.

Use these vocabulary cards with the EL Support Lesson Plan: Adding Within 20.

It's time to check those addition skills! Use this to assess your student’s abilities to add within 20.

Subtract numbers within 20 using ten frames with this first-grade math worksheet!

Master the math of making 10 and 20 with two addends in this helpful addition worksheet!

Master subtraction under 20 with this bright, inviting practice sheet!

Add numbers within 20 using ten frames with this first-grade math worksheet!

Let's check in on those subtraction skills! Use this math worksheet to assess your students’ understanding of subtraction by having them solve subtraction problems within 20.

It's time to check in on those addition skills! Use this math activity to assess your students’ understanding of addition by having them solve addition problems within 20.

Invite your first grader to enter the world of the teen numbers as she starts writing 11-20. Practice tracing the name of each number before writing it.

It's time to check in on those subtraction skills! Use this to assess your student’s abilities to subtract within 20.

Practice finding missing numbers while adding within 20 using ten frames!

Children practice subtraction within 20 in this fall-themed math worksheet.

A curious alien needs help finding fractions. Use your math know-how to fill in the pictured shapes, 1/2 red and 1/2 blue.

Practice addition while solving number puzzles in this engaging worksheet for first and second graders!

Children practice addition within 20 in this fall-themed math worksheet.

It’s time for some DIY! Students will be challenged to solve 20 addition and subtraction problems in this friendly worksheet!

Give your child practice counting objects with this printable worksheet, which focuses on the numbers 15 through 20.

Practice addition and subtraction within 20 with this sweet Valentine’s Day math puzzle!

Use these fun toy themed math problems to assess your students’ ability to solve addition and subtraction problems within 20.

Learners practice addition and subtraction within 20 in this St. Patrick's Day-themed math puzzle!