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

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38 - 19 =

62 - 42 =

66 - 53 =

32 - 12 =

72 - 65 =

87 - 37 =

61 - 21 =

45 - 13 =

73 - 28 =

71 - 28 =

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