21 + 34 =, 52 + 46 =, 35 + 63 =, 28 +71 =, 56 + 5 1=, 43 + 14 =, 40 + 40 =, 37 + 61 =, 11 + 18 =, 66 + 22 =.

2-Digit Addition without regrouping

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