1.OA.B.4 Worksheets: Subtraction as Unknown Addend

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1.OA.B.4 (Operations and Algebraic Thinking): Think of a subtraction fact as a missing-addend addition fact.

About this standard

Seeing subtraction as a missing addend (10 - 8 is "8 plus what makes 10?") makes subtraction facts much easier to learn. Ask your child to count up instead of back. Practice with Missing Addends Within 10 and Fact Families Within 20; see 1.OA.C.6 for fact fluency.

Worksheets for 1.OA.B.4

Missing Addends Within 10Grade 1 · Addition & Subtraction · 10 versions
Subtraction as an Unknown AddendGrade 1 · Addition & Subtraction · 10 versions
Subtraction Within 10Grade 1 · Addition & Subtraction · 10 versions
Fact Families Within 10Grade 1 · Addition & Subtraction · 10 versions
Fact Families Within 20Grade 1 · Addition & Subtraction · 10 versions

More 1st Grade Math standards in Operations and Algebraic Thinking

1.OA.A.1: Word Problems Within 20
1.OA.A.2: Add Three Numbers in Word Problems
1.OA.B.3: Properties of Addition
1.OA.C.5: Counting to Add
1.OA.C.6: Add and Subtract Within 20
1.OA.D.7: Meaning of the Equal Sign
1.OA.D.8: Find the Missing Number

All 1st Grade Math standards →