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Find the Missing Addend

Find the Missing Addend

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Tags: math   addition   subtraction   1.oa.4   1.oa.8   1.oa.6   1.oa.3   common core   1st grade  

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X = 16
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The unknown number can be represented by X.
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10 - 3 equals 7. X = 7
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Hint. If you invert the operation on both sides of the equal sign will give you the answer.
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X = 3
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On the left side of the equal sign, +2 - 2 = 0 and on the right side 5 - 2 = 3
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1 - 11 = 10
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Hint. Don't be confused when X is not at the beginning. Only substract the first number on both sides of the equal sign.
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