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Mental Addition Worksheet for Class 2 and 3

Mental maths lesson 6: Add 2-digit numbers left to right · Set 239 · 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. 1.78 + 38 =
  2. 2.35 + 41 =
  3. 3.75 + 24 =
  4. 4.32 + 13 =
  5. 5.28 + 51 =
  6. 6.33 + 81 =
  7. 7.32 + 31 =
  8. 8.36 + 26 =
  9. 9.83 + 77 =
  10. 10.44 + 43 =
  11. 11.47 + 19 =
  12. 12.74 + 68 =
  13. 13.23 + 22 =
  14. 14.61 + 52 =
  15. 15.62 + 16 =
  16. 16.26 + 81 =
  17. 17.53 + 59 =
  18. 18.58 + 15 =
  19. 19.42 + 58 =
  20. 20.48 + 16 =
  21. 21.26 + 63 =
  22. 22.50 + 78 =
  23. 23.40 + 18 =
  24. 24.56 + 78 =
  25. 25.75 + 67 =
  26. 26.82 + 39 =
  27. 27.79 + 28 =
  28. 28.65 + 81 =
  29. 29.51 + 82 =
  30. 30.34 + 43 =
  31. 31.73 + 69 =
  32. 32.56 + 33 =
  33. 33.59 + 77 =
  34. 34.75 + 51 =
  35. 35.31 + 51 =
  36. 36.42 + 64 =
  37. 37.42 + 18 =
  38. 38.47 + 13 =
  39. 39.28 + 25 =
  40. 40.63 + 67 =

Answer key

  1. 116
  2. 76
  3. 99
  4. 45
  5. 79
  6. 114
  7. 63
  8. 62
  9. 160
  10. 87
  11. 66
  12. 142
  13. 45
  14. 113
  15. 78
  16. 107
  17. 112
  18. 73
  19. 100
  20. 64
  21. 89
  22. 128
  23. 58
  24. 134
  25. 142
  26. 121
  27. 107
  28. 146
  29. 133
  30. 77
  31. 142
  32. 89
  33. 136
  34. 126
  35. 82
  36. 106
  37. 60
  38. 60
  39. 53
  40. 130

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