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

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97 - 17 =

48 - 35 =

83 - 73 =

85 - 21 =

36 - 24 =

67 - 30 =

92 - 84 =

87 - 75 =

59 - 27 =

84 - 21 =

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