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

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40 + 83 =

52 + 87 =

38 + 62 =

39 + 97 =

32 + 90 =

62 + 27 =

35 + 15 =

31 + 26 =

25 + 47 =

65 + 26 =

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