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Arithmetic ability: Level One: Mental subtraction of two-digit numbers.

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41 - 20 =

99 - 96 =

68 - 17 =

24 - 10 =

68 - 64 =

52 - 36 =

93 - 47 =

71 - 67 =

54 - 13 =

69 - 50 =

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