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

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723 - 605 =

933 - 494 =

763 - 448 =

619 - 460 =

493 - 324 =

581 - 546 =

264 - 116 =

777 - 776 =

666 - 357 =

860 - 192 =

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