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Mental Addition Worksheet for Class 2 and 3

Mental maths lesson 6: Add 2-digit numbers left to right · Set 167 · 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. 1.74 + 64 =
  2. 2.21 + 54 =
  3. 3.88 + 55 =
  4. 4.34 + 78 =
  5. 5.79 + 12 =
  6. 6.34 + 65 =
  7. 7.68 + 26 =
  8. 8.39 + 37 =
  9. 9.34 + 15 =
  10. 10.48 + 17 =
  11. 11.62 + 79 =
  12. 12.55 + 28 =
  13. 13.40 + 37 =
  14. 14.86 + 39 =
  15. 15.21 + 23 =
  16. 16.63 + 79 =
  17. 17.27 + 71 =
  18. 18.27 + 44 =
  19. 19.24 + 81 =
  20. 20.48 + 15 =
  21. 21.47 + 51 =
  22. 22.58 + 14 =
  23. 23.39 + 33 =
  24. 24.76 + 26 =
  25. 25.37 + 77 =
  26. 26.76 + 68 =
  27. 27.86 + 19 =
  28. 28.59 + 49 =
  29. 29.49 + 71 =
  30. 30.28 + 45 =
  31. 31.21 + 78 =
  32. 32.77 + 45 =
  33. 33.69 + 86 =
  34. 34.52 + 82 =
  35. 35.87 + 69 =
  36. 36.54 + 12 =
  37. 37.57 + 22 =
  38. 38.72 + 22 =
  39. 39.35 + 26 =
  40. 40.88 + 32 =

Answer key

  1. 138
  2. 75
  3. 143
  4. 112
  5. 91
  6. 99
  7. 94
  8. 76
  9. 49
  10. 65
  11. 141
  12. 83
  13. 77
  14. 125
  15. 44
  16. 142
  17. 98
  18. 71
  19. 105
  20. 63
  21. 98
  22. 72
  23. 72
  24. 102
  25. 114
  26. 144
  27. 105
  28. 108
  29. 120
  30. 73
  31. 99
  32. 122
  33. 155
  34. 134
  35. 156
  36. 66
  37. 79
  38. 94
  39. 61
  40. 120

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