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Mental Addition Worksheet for Class 2 and 3

Mental maths lesson 6: Add 2-digit numbers left to right · Set 837 · 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 + 36 =
  2. 2.23 + 56 =
  3. 3.33 + 82 =
  4. 4.75 + 15 =
  5. 5.51 + 21 =
  6. 6.68 + 51 =
  7. 7.28 + 51 =
  8. 8.59 + 21 =
  9. 9.88 + 77 =
  10. 10.63 + 44 =
  11. 11.62 + 79 =
  12. 12.37 + 41 =
  13. 13.74 + 31 =
  14. 14.66 + 87 =
  15. 15.26 + 33 =
  16. 16.45 + 69 =
  17. 17.38 + 62 =
  18. 18.68 + 65 =
  19. 19.26 + 65 =
  20. 20.61 + 36 =
  21. 21.40 + 51 =
  22. 22.34 + 59 =
  23. 23.80 + 74 =
  24. 24.31 + 56 =
  25. 25.79 + 49 =
  26. 26.39 + 41 =
  27. 27.73 + 84 =
  28. 28.37 + 83 =
  29. 29.85 + 53 =
  30. 30.59 + 17 =
  31. 31.51 + 25 =
  32. 32.74 + 16 =
  33. 33.78 + 66 =
  34. 34.87 + 21 =
  35. 35.56 + 49 =
  36. 36.42 + 83 =
  37. 37.74 + 29 =
  38. 38.61 + 45 =
  39. 39.70 + 51 =
  40. 40.28 + 81 =

Answer key

  1. 123
  2. 79
  3. 115
  4. 90
  5. 72
  6. 119
  7. 79
  8. 80
  9. 165
  10. 107
  11. 141
  12. 78
  13. 105
  14. 153
  15. 59
  16. 114
  17. 100
  18. 133
  19. 91
  20. 97
  21. 91
  22. 93
  23. 154
  24. 87
  25. 128
  26. 80
  27. 157
  28. 120
  29. 138
  30. 76
  31. 76
  32. 90
  33. 144
  34. 108
  35. 105
  36. 125
  37. 103
  38. 106
  39. 121
  40. 109

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