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Grade 1Addition & Subtraction

1.OA.B.4

See 10 − 8 as "8 plus what makes 10?" — subtraction is a missing addend.

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Subtract by Adding Up1 way
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The standard, officially

Understand subtraction as an unknown-addend problem. For example, subtract 10 – 8 by finding the number that makes 10 when added to 8.

Builds on
K.OA.A.2Solve add and subtract stories to 10
Leads to
1.OA.C.6Add and subtract within 20 2.NBT.B.9Explain why a strategy works 3.NBT.A.2Add and subtract within 1000 4.NF.B.3Add and subtract fractions