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Mental Addition Worksheet for Class 2 and 3

Mental maths lesson 6: Add 2-digit numbers left to right · Set 158 · 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. 1.86 + 21 =
  2. 2.42 + 82 =
  3. 3.34 + 32 =
  4. 4.80 + 12 =
  5. 5.53 + 18 =
  6. 6.75 + 66 =
  7. 7.73 + 12 =
  8. 8.41 + 39 =
  9. 9.74 + 71 =
  10. 10.66 + 34 =
  11. 11.45 + 23 =
  12. 12.43 + 85 =
  13. 13.32 + 14 =
  14. 14.33 + 12 =
  15. 15.63 + 15 =
  16. 16.55 + 79 =
  17. 17.30 + 73 =
  18. 18.28 + 14 =
  19. 19.64 + 74 =
  20. 20.82 + 86 =
  21. 21.82 + 16 =
  22. 22.62 + 85 =
  23. 23.52 + 24 =
  24. 24.71 + 83 =
  25. 25.24 + 85 =
  26. 26.64 + 86 =
  27. 27.72 + 88 =
  28. 28.65 + 64 =
  29. 29.42 + 43 =
  30. 30.74 + 89 =
  31. 31.87 + 34 =
  32. 32.78 + 21 =
  33. 33.86 + 51 =
  34. 34.32 + 88 =
  35. 35.27 + 58 =
  36. 36.82 + 69 =
  37. 37.67 + 58 =
  38. 38.21 + 19 =
  39. 39.36 + 49 =
  40. 40.42 + 28 =

Answer key

  1. 107
  2. 124
  3. 66
  4. 92
  5. 71
  6. 141
  7. 85
  8. 80
  9. 145
  10. 100
  11. 68
  12. 128
  13. 46
  14. 45
  15. 78
  16. 134
  17. 103
  18. 42
  19. 138
  20. 168
  21. 98
  22. 147
  23. 76
  24. 154
  25. 109
  26. 150
  27. 160
  28. 129
  29. 85
  30. 163
  31. 121
  32. 99
  33. 137
  34. 120
  35. 85
  36. 151
  37. 125
  38. 40
  39. 85
  40. 70

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