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

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19 + 18 =

40 + 86 =

14 + 25 =

78 + 75 =

46 + 66 =

98 + 15 =

53 + 95 =

52 + 35 =

82 + 68 =

93 + 20 =

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