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

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615 - 423 =

883 - 189 =

596 - 193 =

750 - 344 =

650 - 409 =

583 - 439 =

765 - 383 =

752 - 481 =

644 - 400 =

699 - 686 =

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