21 + 14 =, 52 + 26 =, 35 + 13 =, 28 + 71 =, 56 + 31=, 43 + 44 =, 40 + 10 =, 37 + 21 =, 11 + 58 =, 66 + 12 =.

Addition 2-Digit numbers without regrouping

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