Find the Missing Number (Addition)

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Find the unknown number: 14 + __ = 19

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5

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CCSS.1.OA.A.1

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Find the unknown number: __ + 11 = 19

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8

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CCSS.1.OA.A.1

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Find the unknown number: __ + 11 = 14

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3

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CCSS.1.OA.D.8

Front

Find the unknown number: 16 + __ = 19

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3

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CCSS.1.OA.D.8

Front

Find the unknown number: __ + 9 = 15

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6

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CCSS.1.OA.A.1

Front

Definition: The process of finding a missing number in an addition equation.

Back

Solving for the unknown by using subtraction.

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CCSS.1.OA.D.8

Front

Key Concept: In an addition equation, if you know the sum and one addend, you can find the missing addend.

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Subtract the known addend from the sum.

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CCSS.2.OA.A.1

Front

Example: If the sum is 20 and one addend is 12, what is the missing number?

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20 - 12 = 8.

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CCSS.2.OA.A.1

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Definition: Addend

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A number that is added to another number.

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CCSS.1.OA.A.1

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Key Concept: The sum is the result of adding two or more numbers together.

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Example: 5 + 3 = 8, where 8 is the sum.

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CCSS.2.OA.C.3