21 加法 8 等于多少？

21 + 8 = 29

21加法8 等于 29

竖式演算

21+829

验算

  • 用减法验算：29 − 8 = 21
  • 用减法验算：29 − 21 = 8

相关题目

21 + 7 = 28 21 + 9 = 30 21 + 6 = 27 21 + 10 = 31 21 + 11 = 32 21 + 5 = 26 21 + 12 = 33 21 + 4 = 25 20 + 8 = 28 22 + 8 = 30 19 + 8 = 27 23 + 8 = 31 24 + 8 = 32 18 + 8 = 26 25 + 8 = 33 17 + 8 = 25 1 + 28 = 29 2 + 27 = 29 3 + 26 = 29 4 + 25 = 29 5 + 24 = 29 6 + 23 = 29 50 + 26 = 76 69 + 30 = 99 63 + 12 = 75 42 + 43 = 85 78 + 1 = 79 100 + 63 = 163 62 - 33 = 29 77 - 48 = 29