K.OA.A.3 — Decompose numbers less than or equal to 10 into pairs in more than one way.

What this standard asks students to do

K.OA.A.3 is a Kindergarten Common Core standard in the Operations & Algebraic Thinking strand. It asks students to: decompose numbers less than or equal to 10 into pairs in more than one way. Teachers typically address it during the understand addition and subtraction cluster, alongside the related standards listed below. FoxFish generates printable worksheets, auto-graded quizzes, and flashcard sets aligned to this standard in seconds.

Sample questions aligned to K.OA.A.3

1. Example 1

   Show two ways to make 7 with two groups.

2. Example 2

   5 = 4 + ___ and 5 = 2 + ___.

3. Example 3

   List every pair that adds to 6.

Want a full worksheet? Generate 20 problems aligned to K.OA.A.3.

Common student mistakes

Build distractors and reteach prompts around the errors students actually make on this standard.

• 1Rushing to an answer without showing the work with pictures or manipulatives — kindergarten students who skip this stage often can't debug their own errors.
• 2Mis-identifying what the prompt is actually asking. On K.OA.A.3, teachers see students latch onto surface keywords and pick the wrong operation.
• 3Applying a memorized procedure to a case where it doesn't fit — the classic operations & algebraic thinking trap when problems change form (e.g., Show two ways to make 7 with two groups.).

Teacher FAQ

Related standards in this cluster

• K.OA.A.1Represent addition and subtraction with objects, fingers, drawings, sounds, or equations.
• K.OA.A.2Solve addition and subtraction word problems, and add and subtract within 10.
• K.OA.A.5Fluently add and subtract within 5.

Teacher guides for K.OA.A.3

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