Completion
Complete each
statement.
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1.
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 Solve the following problem. 20 -10=
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2.
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 Solve the following problem. 50-30=
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3.
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 Solve the following problem. 30-20=
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4.
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 Solve this equation: 10 - 10 = ?
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5.
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 Solve the following problem. 40 -30=
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6.
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7.
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8.
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 Solve the following problem. 70-40 =
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9.
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 Solve the following problem. 90-20 =
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10.
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 Solve the following problem. 90-40=
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