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Mental Addition Worksheet for Class 2 and 3

Mental maths lesson 6: Add 2-digit numbers left to right · Set 140 · 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. 1.23 + 77 =
  2. 2.84 + 51 =
  3. 3.22 + 52 =
  4. 4.69 + 24 =
  5. 5.44 + 71 =
  6. 6.72 + 12 =
  7. 7.48 + 27 =
  8. 8.43 + 24 =
  9. 9.56 + 14 =
  10. 10.78 + 16 =
  11. 11.21 + 75 =
  12. 12.43 + 27 =
  13. 13.40 + 17 =
  14. 14.34 + 81 =
  15. 15.33 + 54 =
  16. 16.72 + 28 =
  17. 17.63 + 33 =
  18. 18.58 + 78 =
  19. 19.29 + 22 =
  20. 20.53 + 82 =
  21. 21.35 + 13 =
  22. 22.62 + 47 =
  23. 23.50 + 31 =
  24. 24.87 + 22 =
  25. 25.32 + 39 =
  26. 26.77 + 74 =
  27. 27.84 + 66 =
  28. 28.38 + 45 =
  29. 29.52 + 35 =
  30. 30.65 + 36 =
  31. 31.85 + 73 =
  32. 32.51 + 68 =
  33. 33.31 + 17 =
  34. 34.67 + 14 =
  35. 35.29 + 88 =
  36. 36.83 + 64 =
  37. 37.48 + 71 =
  38. 38.85 + 62 =
  39. 39.36 + 82 =
  40. 40.24 + 23 =

Answer key

  1. 100
  2. 135
  3. 74
  4. 93
  5. 115
  6. 84
  7. 75
  8. 67
  9. 70
  10. 94
  11. 96
  12. 70
  13. 57
  14. 115
  15. 87
  16. 100
  17. 96
  18. 136
  19. 51
  20. 135
  21. 48
  22. 109
  23. 81
  24. 109
  25. 71
  26. 151
  27. 150
  28. 83
  29. 87
  30. 101
  31. 158
  32. 119
  33. 48
  34. 81
  35. 117
  36. 147
  37. 119
  38. 147
  39. 118
  40. 47

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