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

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13 + 89 =

46 + 15 =

52 + 81 =

41 + 62 =

69 + 79 =

21 + 69 =

16 + 71 =

20 + 78 =

70 + 33 =

18 + 91 =

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