13 加法 8 等于多少？

13 + 8 = 21

13加法8 等于 21

竖式演算

113+821

验算

  • 用减法验算：21 − 8 = 13
  • 用减法验算：21 − 13 = 8

相关题目

13 + 7 = 20 13 + 9 = 22 13 + 6 = 19 13 + 10 = 23 13 + 11 = 24 13 + 5 = 18 13 + 12 = 25 13 + 4 = 17 12 + 8 = 20 14 + 8 = 22 11 + 8 = 19 15 + 8 = 23 10 + 8 = 18 16 + 8 = 24 17 + 8 = 25 9 + 8 = 17 1 + 20 = 21 2 + 19 = 21 3 + 18 = 21 4 + 17 = 21 5 + 16 = 21 6 + 15 = 21 59 + 70 = 129 97 + 40 = 137 72 + 66 = 138 46 + 83 = 129 91 + 63 = 154 46 + 38 = 84 38 - 17 = 21 35 - 14 = 21