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Mental Addition Worksheet for Class 2 and 3

Mental maths lesson 6: Add 2-digit numbers left to right · Set 813 · 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. 1.73 + 42 =
  2. 2.65 + 53 =
  3. 3.44 + 65 =
  4. 4.77 + 68 =
  5. 5.24 + 51 =
  6. 6.64 + 12 =
  7. 7.35 + 22 =
  8. 8.64 + 85 =
  9. 9.28 + 37 =
  10. 10.27 + 43 =
  11. 11.71 + 31 =
  12. 12.34 + 51 =
  13. 13.84 + 41 =
  14. 14.52 + 54 =
  15. 15.60 + 39 =
  16. 16.81 + 33 =
  17. 17.78 + 83 =
  18. 18.51 + 35 =
  19. 19.42 + 33 =
  20. 20.83 + 86 =
  21. 21.21 + 31 =
  22. 22.87 + 28 =
  23. 23.71 + 34 =
  24. 24.84 + 21 =
  25. 25.69 + 86 =
  26. 26.84 + 63 =
  27. 27.88 + 73 =
  28. 28.50 + 31 =
  29. 29.76 + 14 =
  30. 30.24 + 56 =
  31. 31.48 + 19 =
  32. 32.50 + 65 =
  33. 33.23 + 14 =
  34. 34.54 + 62 =
  35. 35.68 + 19 =
  36. 36.58 + 52 =
  37. 37.61 + 82 =
  38. 38.61 + 51 =
  39. 39.68 + 79 =
  40. 40.86 + 37 =

Answer key

  1. 115
  2. 118
  3. 109
  4. 145
  5. 75
  6. 76
  7. 57
  8. 149
  9. 65
  10. 70
  11. 102
  12. 85
  13. 125
  14. 106
  15. 99
  16. 114
  17. 161
  18. 86
  19. 75
  20. 169
  21. 52
  22. 115
  23. 105
  24. 105
  25. 155
  26. 147
  27. 161
  28. 81
  29. 90
  30. 80
  31. 67
  32. 115
  33. 37
  34. 116
  35. 87
  36. 110
  37. 143
  38. 112
  39. 147
  40. 123

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