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Arithmetic ability: level two: mental subtraction of three-digit numbers.

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701 - 686 =

950 - 240 =

480 - 384 =

859 - 728 =

624 - 127 =

635 - 618 =

882 - 670 =

340 - 147 =

820 - 642 =

267 - 234 =

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