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Mental Addition Worksheet for Class 2 and 3

Mental maths lesson 6: Add 2-digit numbers left to right · Set 234 · 40 questions
TalentJR

How to do it in your head (Tens first): Keep the first number as it is. Add the tens of the second number. Add the ones.

NameDateTime takenScore ___ / 40
  1. 1.39 + 41 =
  2. 2.67 + 55 =
  3. 3.63 + 31 =
  4. 4.78 + 68 =
  5. 5.37 + 43 =
  6. 6.70 + 73 =
  7. 7.51 + 31 =
  8. 8.51 + 51 =
  9. 9.81 + 12 =
  10. 10.41 + 23 =
  11. 11.40 + 36 =
  12. 12.29 + 57 =
  13. 13.58 + 54 =
  14. 14.54 + 28 =
  15. 15.43 + 41 =
  16. 16.36 + 31 =
  17. 17.89 + 44 =
  18. 18.76 + 66 =
  19. 19.43 + 33 =
  20. 20.51 + 63 =
  21. 21.54 + 47 =
  22. 22.60 + 55 =
  23. 23.79 + 25 =
  24. 24.30 + 17 =
  25. 25.77 + 24 =
  26. 26.89 + 34 =
  27. 27.74 + 79 =
  28. 28.23 + 62 =
  29. 29.84 + 19 =
  30. 30.68 + 39 =
  31. 31.37 + 15 =
  32. 32.89 + 49 =
  33. 33.86 + 46 =
  34. 34.75 + 82 =
  35. 35.27 + 61 =
  36. 36.80 + 87 =
  37. 37.64 + 22 =
  38. 38.63 + 65 =
  39. 39.70 + 26 =
  40. 40.79 + 21 =

Answer key

  1. 80
  2. 122
  3. 94
  4. 146
  5. 80
  6. 143
  7. 82
  8. 102
  9. 93
  10. 64
  11. 76
  12. 86
  13. 112
  14. 82
  15. 84
  16. 67
  17. 133
  18. 142
  19. 76
  20. 114
  21. 101
  22. 115
  23. 104
  24. 47
  25. 101
  26. 123
  27. 153
  28. 85
  29. 103
  30. 107
  31. 52
  32. 138
  33. 132
  34. 157
  35. 88
  36. 167
  37. 86
  38. 128
  39. 96
  40. 100

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