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Mental Addition Worksheet for Class 2 and 3

Mental maths lesson 6: Add 2-digit numbers left to right · Set 513 · 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 + 12 =
  2. 2.48 + 32 =
  3. 3.22 + 55 =
  4. 4.64 + 61 =
  5. 5.30 + 21 =
  6. 6.56 + 32 =
  7. 7.33 + 23 =
  8. 8.27 + 21 =
  9. 9.66 + 21 =
  10. 10.42 + 61 =
  11. 11.35 + 28 =
  12. 12.68 + 44 =
  13. 13.52 + 31 =
  14. 14.68 + 21 =
  15. 15.74 + 65 =
  16. 16.64 + 71 =
  17. 17.43 + 54 =
  18. 18.86 + 41 =
  19. 19.89 + 53 =
  20. 20.84 + 32 =
  21. 21.21 + 76 =
  22. 22.40 + 59 =
  23. 23.52 + 27 =
  24. 24.73 + 71 =
  25. 25.50 + 84 =
  26. 26.86 + 86 =
  27. 27.73 + 21 =
  28. 28.80 + 85 =
  29. 29.85 + 65 =
  30. 30.59 + 78 =
  31. 31.72 + 71 =
  32. 32.46 + 71 =
  33. 33.56 + 57 =
  34. 34.87 + 87 =
  35. 35.80 + 66 =
  36. 36.58 + 73 =
  37. 37.49 + 19 =
  38. 38.36 + 45 =
  39. 39.41 + 68 =
  40. 40.48 + 28 =

Answer key

  1. 45
  2. 80
  3. 77
  4. 125
  5. 51
  6. 88
  7. 56
  8. 48
  9. 87
  10. 103
  11. 63
  12. 112
  13. 83
  14. 89
  15. 139
  16. 135
  17. 97
  18. 127
  19. 142
  20. 116
  21. 97
  22. 99
  23. 79
  24. 144
  25. 134
  26. 172
  27. 94
  28. 165
  29. 150
  30. 137
  31. 143
  32. 117
  33. 113
  34. 174
  35. 146
  36. 131
  37. 68
  38. 81
  39. 109
  40. 76

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