CCSS.Math.Content.K.OA.A.5
The standard
Fluently add and subtract within 5.
Common Core State Standards for Mathematics · Operations and Algebraic Thinking
What this standard means
Students need to know small sums and differences up to 5 without counting every object one by one. They should see 5 as flexible, like 4 and 1, 3 and 2, or 5 and 0, and use those facts for both adding and subtracting.
Mastery looks quick, accurate, and calm. Students can answer with fingers, counters, drawings, or mental images, then explain how they know. Many get stuck counting all from 1 each time, mixing up add and take away, or not seeing subtraction as connected to addition facts.
Ways to teach it
- Give pairs five two-color counters and have them shake, spill, and record every way to make 5.
- Ask, “If I have 5 snacks and eat 2, how do you know how many are left?”
- Flash dot cards from 0 to 5 for three seconds, then ask students to say the total or missing part.
- Use classroom cleanup: “There were 5 crayons, 3 are in the cup, how many are still on the table?”
Plan a lesson for CCSS.Math.Content.K.OA.A.5
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Related standards
- CCSS.Math.Content.2.NBT.B.5
Fluently add and subtract within 100 using strategies based on place value, properties of operations, and/or the relationship between addition and subtraction.
- CCSS.Math.Content.2.OA.B.2
Fluently add and subtract within 20 using mental strategies. By end of Grade 2, know from memory all sums of two one-digit numbers.
- CCSS.Math.Content.3.NBT.A.2
Fluently add and subtract within 1000 using strategies and algorithms based on place value, properties of operations, and/or the relationship between addition a...
- CCSS.Math.Content.4.NBT.B.4
Fluently add and subtract multi-digit whole numbers using the standard algorithm.