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Mental Addition Worksheet for Class 2 and 3

Mental maths lesson 6: Add 2-digit numbers left to right · Set 615 · 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. 1.77 + 36 =
  2. 2.63 + 74 =
  3. 3.33 + 86 =
  4. 4.24 + 86 =
  5. 5.31 + 47 =
  6. 6.29 + 52 =
  7. 7.43 + 63 =
  8. 8.32 + 68 =
  9. 9.66 + 47 =
  10. 10.56 + 81 =
  11. 11.69 + 13 =
  12. 12.72 + 86 =
  13. 13.80 + 22 =
  14. 14.21 + 87 =
  15. 15.63 + 23 =
  16. 16.79 + 49 =
  17. 17.26 + 43 =
  18. 18.59 + 61 =
  19. 19.41 + 39 =
  20. 20.24 + 27 =
  21. 21.45 + 16 =
  22. 22.71 + 28 =
  23. 23.80 + 16 =
  24. 24.27 + 54 =
  25. 25.85 + 21 =
  26. 26.21 + 55 =
  27. 27.31 + 81 =
  28. 28.34 + 75 =
  29. 29.37 + 28 =
  30. 30.37 + 65 =
  31. 31.71 + 21 =
  32. 32.62 + 85 =
  33. 33.69 + 66 =
  34. 34.34 + 82 =
  35. 35.29 + 34 =
  36. 36.62 + 35 =
  37. 37.28 + 63 =
  38. 38.68 + 17 =
  39. 39.74 + 65 =
  40. 40.51 + 46 =

Answer key

  1. 113
  2. 137
  3. 119
  4. 110
  5. 78
  6. 81
  7. 106
  8. 100
  9. 113
  10. 137
  11. 82
  12. 158
  13. 102
  14. 108
  15. 86
  16. 128
  17. 69
  18. 120
  19. 80
  20. 51
  21. 61
  22. 99
  23. 96
  24. 81
  25. 106
  26. 76
  27. 112
  28. 109
  29. 65
  30. 102
  31. 92
  32. 147
  33. 135
  34. 116
  35. 63
  36. 97
  37. 91
  38. 85
  39. 139
  40. 97

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