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

排行榜

視覺風格

選項

切換範本

恢復自動保存: ?