What addition skills should a kindergartener know?

By the end of kindergarten, students should fluently add within 5 (CCSS K.OA.A.5) and solve addition word problems within 10 (K.OA.A.2). They should understand that addition means putting together or adding to, and be able to decompose numbers up to 10 into pairs.

How can I help my kindergartener practice addition at home?

Use physical objects like blocks, buttons, or snacks to make addition concrete. Start with adding within 5, then progress to 10. Printable addition worksheets with pictures help bridge the gap between hands-on manipulatives and abstract number sentences.

Kindergarten Decompose Numbers Under 20 Worksheets

Ages 3-6 · Free previews · Print-ready PDFs

Written by Adi Ackerman, Head Teacher

Free printable decompose numbers under 20 worksheets for kindergarten students (Ages 3-6). All worksheets are aligned to Common Core standards and ready to print.

Kindergarten Math Addition Decompose Numbers Under 20 Clear All

$Decompose Numbers Under 20 - Kindergarten Addition worksheet preview$

Decompose Numbers Under 20

GradeKindergarten

TopicAddition

$Decomposing numbers 10-19 - Kindergarten Addition worksheet preview$

Decomposing numbers 10-19

GradeKindergarten

TopicAddition

More addition worksheets

Explore all of our kindergarten addition worksheets, covering addition facts, single-digit addition, addition word problems, decompose numbers under 20, and more.

Addition facts Single-digit addition Addition Word Problems Making 10 Addition Vertical Addition Up to 5 Decompose Numbers Adding Objects To 20 Make Ten Objects Adding Pictures Adding Objects Addition Vertical Sums To 20 Sums To 10 Sums To 20 Number Lines

Frequently Asked Questions

Most kindergarteners are ready to begin addition in the second half of the school year, typically around January or February. The Common Core standard K.OA.A.1 expects students to represent addition within 10 using objects, fingers, drawings, and equations by the end of kindergarten.

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ClassWeekly offers free worksheets and printable learning resources for kids in preschool to grade 5. All worksheets are aligned to Common Core standards and designed by educators. Become a member to access the full library and download unlimited PDFs.