Addition and Subtraction of Round Tens within 100

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What is 30 + 20?
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30 + 20 is 50.
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Subtract 40 from 80.
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80 - 40 is 40.
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Add 50 to 30.
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50 + 30 is 80.
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What is 90 - 10?
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90 - 10 is 80.
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Subtract 20 from 60.
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60 - 20 is 40.
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If you add 10 and 70, what is the result?
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10 + 70 is 80.
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What is 40 + 50?
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40 + 50 is 90.
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Subtract 30 from 60.
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60 - 30 is 30.
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What is 70 - 20?
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70 - 20 is 50.
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If you add 60 to 40, what do you get?
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60 + 40 is 100.
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What is 80 + 10?
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80 + 10 is 90.
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Subtract 50 from 70.
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70 - 50 is 20.
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Add 40 to 20.
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40 + 20 is 60.
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What is 60 - 30?
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60 - 30 is 30.
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Subtract 10 from 90.
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90 - 10 is 80.
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