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

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83 - 80 =

76 - 51 =

74 - 32 =

90 - 30 =

72 - 14 =

82 - 60 =

83 - 44 =

97 - 97 =

97 - 33 =

70 - 19 =

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