K.OA.A.3: Break numbers up to 10 into pairs in more than one way (5 = 2 + 3 = 4 + 1)

Decompose numbers less than or equal to 10 into pairs in more than one way, e.g., by using objects or drawings, and record each decomposition by a drawing or equation (e.g., 5 = 2 + 3 and 5 = 4 + 1).Common Core State Standards for Mathematics, as adopted in the Massachusetts Curriculum Framework for Mathematics (2017), Kindergarten.

Play the game: Five and UnderSteps 3, 5 of the ColorMyMath curriculum · free, no sign-up →

How ColorMyMath teaches it

Addition is a length — dots laid end to end on the number line. Taking away comes down the same line. Every fact is shown as a picture before it is ever asked for from memory.

Every page is free and open — nothing to install, no account, and it works on a phone or a classroom board. Every number has its own color: 1 red, 2 orange, 3 yellow, 4 green, 5 blue, 6 purple, 7 brown, 8 pink, 9 cyan, and a number is that many colored dots.

Where it sits in the curriculum

• Step 3Making 2, 3, 4: 1+1, 1+2, 2+2, 3+1
• Step 5Making 5: 4+1, 3+2
• Step 7Making 10 — Get a Buddy: 5+5, 6+4, 7+3, 8+2, 9+1
• Step 10Doubling 1-5 to make 2, 4, 6, 8, 10
• Step 15Making 7 and 8: 4+3, 5+3
• Step 18Making 9: 5+4, 6+3

More Kindergarten standards in Operations and Algebraic Thinking

• K.OA.A.1Show addition and subtraction with objects, fingers, drawings, sounds and actions
• K.OA.A.2Add and take away word problems within 10
• K.OA.A.4For any number 1 to 9, find the number that makes 10
• K.OA.A.5Add and subtract within 5 fluently

ColorMyMath · getridoftheteacher.com · every number has its own color, and a number is that many colored dots. Matching a game to a standard is a judgement call; the official text is at doe.mass.edu.