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Mental Addition Worksheet for Class 2 and 3

Mental maths lesson 6: Add 2-digit numbers left to right · Set 350 · 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. 1.33 + 21 =
  2. 2.23 + 54 =
  3. 3.70 + 88 =
  4. 4.27 + 26 =
  5. 5.32 + 13 =
  6. 6.78 + 63 =
  7. 7.56 + 55 =
  8. 8.87 + 39 =
  9. 9.26 + 75 =
  10. 10.49 + 87 =
  11. 11.70 + 31 =
  12. 12.34 + 53 =
  13. 13.69 + 45 =
  14. 14.61 + 81 =
  15. 15.87 + 49 =
  16. 16.85 + 41 =
  17. 17.37 + 26 =
  18. 18.44 + 74 =
  19. 19.78 + 82 =
  20. 20.45 + 71 =
  21. 21.51 + 25 =
  22. 22.38 + 66 =
  23. 23.30 + 36 =
  24. 24.49 + 17 =
  25. 25.35 + 83 =
  26. 26.51 + 81 =
  27. 27.34 + 77 =
  28. 28.81 + 49 =
  29. 29.34 + 35 =
  30. 30.58 + 44 =
  31. 31.22 + 71 =
  32. 32.85 + 61 =
  33. 33.83 + 74 =
  34. 34.21 + 89 =
  35. 35.73 + 22 =
  36. 36.29 + 34 =
  37. 37.75 + 31 =
  38. 38.68 + 74 =
  39. 39.36 + 19 =
  40. 40.76 + 35 =

Answer key

  1. 54
  2. 77
  3. 158
  4. 53
  5. 45
  6. 141
  7. 111
  8. 126
  9. 101
  10. 136
  11. 101
  12. 87
  13. 114
  14. 142
  15. 136
  16. 126
  17. 63
  18. 118
  19. 160
  20. 116
  21. 76
  22. 104
  23. 66
  24. 66
  25. 118
  26. 132
  27. 111
  28. 130
  29. 69
  30. 102
  31. 93
  32. 146
  33. 157
  34. 110
  35. 95
  36. 63
  37. 106
  38. 142
  39. 55
  40. 111

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