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Mental Addition Worksheet for Class 2 and 3

Mental maths lesson 6: Add 2-digit numbers left to right · Set 337 · 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. 1.34 + 25 =
  2. 2.57 + 64 =
  3. 3.38 + 31 =
  4. 4.34 + 24 =
  5. 5.29 + 22 =
  6. 6.21 + 53 =
  7. 7.52 + 84 =
  8. 8.29 + 33 =
  9. 9.31 + 23 =
  10. 10.64 + 26 =
  11. 11.71 + 31 =
  12. 12.84 + 59 =
  13. 13.84 + 28 =
  14. 14.28 + 82 =
  15. 15.35 + 46 =
  16. 16.42 + 64 =
  17. 17.55 + 73 =
  18. 18.45 + 65 =
  19. 19.47 + 67 =
  20. 20.70 + 31 =
  21. 21.61 + 46 =
  22. 22.83 + 51 =
  23. 23.68 + 67 =
  24. 24.22 + 89 =
  25. 25.71 + 57 =
  26. 26.83 + 13 =
  27. 27.80 + 51 =
  28. 28.75 + 18 =
  29. 29.63 + 65 =
  30. 30.26 + 79 =
  31. 31.61 + 21 =
  32. 32.23 + 56 =
  33. 33.48 + 45 =
  34. 34.48 + 31 =
  35. 35.38 + 23 =
  36. 36.55 + 34 =
  37. 37.40 + 89 =
  38. 38.85 + 42 =
  39. 39.80 + 64 =
  40. 40.49 + 53 =

Answer key

  1. 59
  2. 121
  3. 69
  4. 58
  5. 51
  6. 74
  7. 136
  8. 62
  9. 54
  10. 90
  11. 102
  12. 143
  13. 112
  14. 110
  15. 81
  16. 106
  17. 128
  18. 110
  19. 114
  20. 101
  21. 107
  22. 134
  23. 135
  24. 111
  25. 128
  26. 96
  27. 131
  28. 93
  29. 128
  30. 105
  31. 82
  32. 79
  33. 93
  34. 79
  35. 61
  36. 89
  37. 129
  38. 127
  39. 144
  40. 102

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