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

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76 - 54 =

71 - 35 =

29 - 20 =

60 - 39 =

82 - 71 =

85 - 10 =

57 - 52 =

79 - 28 =

54 - 11 =

85 - 26 =

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