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1.OA Operations & Algebraic Thinking worksheets

Worksheets for 4 Common Core standards in Operations & Algebraic Thinking, Grade 1. Each worksheet has three levels and an answer key.

Make a mixed 1.OA worksheet
1.OA.B.31.OA.B.41.OA.C.61.OA.D.8
Properties of addition1.OA.B.3Fill in turnaround facts, regroup three addends and add zero, using the commutative, associative and identity properties of addition.Addition and subtraction fact families1.OA.B.4Write the two addition and two subtraction facts that use the same three numbers, including doubles with only two facts.Addition within 201.OA.C.6Add within 20, from sums to 10 up to three addends.Subtraction within 201.OA.C.6Subtract within 20, from facts to 10 up to taking away across ten.Number bonds1.OA.C.6Find the missing part or the missing whole in part-part-whole number bonds within 10, within 20 and with tens.Missing numbers in equations1.OA.D.8Find the unknown number in addition and subtraction equations within 20.