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Mental Addition Worksheet for Class 2 and 3

Mental maths lesson 6: Add 2-digit numbers left to right · Set 347 · 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. 1.24 + 31 =
  2. 2.30 + 25 =
  3. 3.49 + 51 =
  4. 4.27 + 37 =
  5. 5.51 + 85 =
  6. 6.76 + 51 =
  7. 7.32 + 61 =
  8. 8.74 + 49 =
  9. 9.56 + 87 =
  10. 10.34 + 38 =
  11. 11.60 + 46 =
  12. 12.75 + 34 =
  13. 13.62 + 76 =
  14. 14.74 + 18 =
  15. 15.64 + 18 =
  16. 16.80 + 17 =
  17. 17.48 + 14 =
  18. 18.49 + 13 =
  19. 19.66 + 13 =
  20. 20.87 + 18 =
  21. 21.55 + 25 =
  22. 22.80 + 89 =
  23. 23.44 + 31 =
  24. 24.37 + 71 =
  25. 25.37 + 56 =
  26. 26.37 + 38 =
  27. 27.80 + 55 =
  28. 28.28 + 64 =
  29. 29.35 + 61 =
  30. 30.24 + 62 =
  31. 31.60 + 57 =
  32. 32.71 + 38 =
  33. 33.22 + 85 =
  34. 34.80 + 26 =
  35. 35.22 + 34 =
  36. 36.76 + 41 =
  37. 37.34 + 18 =
  38. 38.24 + 22 =
  39. 39.29 + 56 =
  40. 40.60 + 51 =

Answer key

  1. 55
  2. 55
  3. 100
  4. 64
  5. 136
  6. 127
  7. 93
  8. 123
  9. 143
  10. 72
  11. 106
  12. 109
  13. 138
  14. 92
  15. 82
  16. 97
  17. 62
  18. 62
  19. 79
  20. 105
  21. 80
  22. 169
  23. 75
  24. 108
  25. 93
  26. 75
  27. 135
  28. 92
  29. 96
  30. 86
  31. 117
  32. 109
  33. 107
  34. 106
  35. 56
  36. 117
  37. 52
  38. 46
  39. 85
  40. 111

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