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

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671 - 510 =

585 - 518 =

778 - 604 =

704 - 224 =

975 - 397 =

970 - 402 =

831 - 342 =

183 - 130 =

868 - 634 =

567 - 330 =

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