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

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64 - 63 =

53 - 41 =

77 - 12 =

54 - 47 =

47 - 13 =

84 - 65 =

54 - 10 =

68 - 14 =

32 - 12 =

91 - 26 =

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