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

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93 - 25 =

35 - 30 =

24 - 18 =

99 - 67 =

95 - 24 =

98 - 47 =

76 - 18 =

61 - 30 =

65 - 38 =

94 - 22 =

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