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Mental Addition Worksheet for Class 2 and 3

Mental maths lesson 6: Add 2-digit numbers left to right · Set 666 · 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. 1.87 + 51 =
  2. 2.43 + 76 =
  3. 3.78 + 26 =
  4. 4.75 + 79 =
  5. 5.33 + 51 =
  6. 6.62 + 52 =
  7. 7.34 + 31 =
  8. 8.26 + 79 =
  9. 9.27 + 23 =
  10. 10.68 + 49 =
  11. 11.73 + 72 =
  12. 12.21 + 38 =
  13. 13.71 + 51 =
  14. 14.48 + 68 =
  15. 15.76 + 51 =
  16. 16.23 + 68 =
  17. 17.28 + 66 =
  18. 18.79 + 52 =
  19. 19.84 + 76 =
  20. 20.74 + 17 =
  21. 21.58 + 71 =
  22. 22.44 + 21 =
  23. 23.22 + 33 =
  24. 24.36 + 77 =
  25. 25.46 + 48 =
  26. 26.40 + 69 =
  27. 27.66 + 83 =
  28. 28.27 + 54 =
  29. 29.22 + 49 =
  30. 30.72 + 31 =
  31. 31.84 + 45 =
  32. 32.54 + 15 =
  33. 33.78 + 88 =
  34. 34.58 + 89 =
  35. 35.45 + 15 =
  36. 36.23 + 23 =
  37. 37.55 + 49 =
  38. 38.32 + 13 =
  39. 39.40 + 28 =
  40. 40.23 + 41 =

Answer key

  1. 138
  2. 119
  3. 104
  4. 154
  5. 84
  6. 114
  7. 65
  8. 105
  9. 50
  10. 117
  11. 145
  12. 59
  13. 122
  14. 116
  15. 127
  16. 91
  17. 94
  18. 131
  19. 160
  20. 91
  21. 129
  22. 65
  23. 55
  24. 113
  25. 94
  26. 109
  27. 149
  28. 81
  29. 71
  30. 103
  31. 129
  32. 69
  33. 166
  34. 147
  35. 60
  36. 46
  37. 104
  38. 45
  39. 68
  40. 64

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