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

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52 + 96 =

42 + 11 =

96 + 86 =

93 + 94 =

54 + 95 =

41 + 83 =

75 + 66 =

65 + 56 =

13 + 48 =

52 + 71 =

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