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Arithmetic Ability: Level One: Mental Addition of two-digit numbers.

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89 + 77 =

59 + 80 =

50 + 21 =

22 + 28 =

11 + 99 =

32 + 73 =

34 + 50 =

41 + 92 =

78 + 30 =

94 + 90 =

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