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Mental Addition Worksheet for Class 2 and 3

Mental maths lesson 6: Add 2-digit numbers left to right · Set 364 · 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. 1.77 + 51 =
  2. 2.43 + 21 =
  3. 3.61 + 81 =
  4. 4.81 + 51 =
  5. 5.60 + 56 =
  6. 6.40 + 25 =
  7. 7.33 + 57 =
  8. 8.55 + 58 =
  9. 9.45 + 57 =
  10. 10.75 + 44 =
  11. 11.42 + 65 =
  12. 12.66 + 68 =
  13. 13.49 + 35 =
  14. 14.39 + 66 =
  15. 15.64 + 14 =
  16. 16.44 + 73 =
  17. 17.72 + 75 =
  18. 18.79 + 72 =
  19. 19.70 + 51 =
  20. 20.23 + 26 =
  21. 21.22 + 35 =
  22. 22.31 + 55 =
  23. 23.41 + 21 =
  24. 24.21 + 26 =
  25. 25.89 + 82 =
  26. 26.21 + 89 =
  27. 27.29 + 51 =
  28. 28.69 + 85 =
  29. 29.53 + 25 =
  30. 30.30 + 32 =
  31. 31.26 + 42 =
  32. 32.84 + 47 =
  33. 33.80 + 66 =
  34. 34.69 + 53 =
  35. 35.48 + 88 =
  36. 36.51 + 87 =
  37. 37.42 + 46 =
  38. 38.66 + 48 =
  39. 39.26 + 47 =
  40. 40.52 + 17 =

Answer key

  1. 128
  2. 64
  3. 142
  4. 132
  5. 116
  6. 65
  7. 90
  8. 113
  9. 102
  10. 119
  11. 107
  12. 134
  13. 84
  14. 105
  15. 78
  16. 117
  17. 147
  18. 151
  19. 121
  20. 49
  21. 57
  22. 86
  23. 62
  24. 47
  25. 171
  26. 110
  27. 80
  28. 154
  29. 78
  30. 62
  31. 68
  32. 131
  33. 146
  34. 122
  35. 136
  36. 138
  37. 88
  38. 114
  39. 73
  40. 69

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