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

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891 - 681 =

826 - 665 =

462 - 433 =

918 - 335 =

622 - 530 =

415 - 380 =

957 - 425 =

759 - 392 =

656 - 600 =

985 - 853 =

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