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Mental Addition Worksheet for Class 2 and 3

Mental maths lesson 6: Add 2-digit numbers left to right · Set 656 · 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. 1.78 + 79 =
  2. 2.82 + 28 =
  3. 3.54 + 36 =
  4. 4.55 + 43 =
  5. 5.65 + 79 =
  6. 6.42 + 39 =
  7. 7.82 + 33 =
  8. 8.43 + 71 =
  9. 9.86 + 83 =
  10. 10.27 + 82 =
  11. 11.24 + 84 =
  12. 12.47 + 71 =
  13. 13.81 + 76 =
  14. 14.73 + 54 =
  15. 15.77 + 66 =
  16. 16.22 + 16 =
  17. 17.42 + 19 =
  18. 18.65 + 69 =
  19. 19.66 + 64 =
  20. 20.40 + 71 =
  21. 21.54 + 16 =
  22. 22.35 + 45 =
  23. 23.87 + 78 =
  24. 24.43 + 68 =
  25. 25.80 + 61 =
  26. 26.72 + 27 =
  27. 27.36 + 48 =
  28. 28.27 + 12 =
  29. 29.77 + 88 =
  30. 30.62 + 78 =
  31. 31.62 + 61 =
  32. 32.31 + 12 =
  33. 33.74 + 59 =
  34. 34.21 + 76 =
  35. 35.80 + 51 =
  36. 36.40 + 39 =
  37. 37.26 + 82 =
  38. 38.40 + 38 =
  39. 39.56 + 79 =
  40. 40.72 + 71 =

Answer key

  1. 157
  2. 110
  3. 90
  4. 98
  5. 144
  6. 81
  7. 115
  8. 114
  9. 169
  10. 109
  11. 108
  12. 118
  13. 157
  14. 127
  15. 143
  16. 38
  17. 61
  18. 134
  19. 130
  20. 111
  21. 70
  22. 80
  23. 165
  24. 111
  25. 141
  26. 99
  27. 84
  28. 39
  29. 165
  30. 140
  31. 123
  32. 43
  33. 133
  34. 97
  35. 131
  36. 79
  37. 108
  38. 78
  39. 135
  40. 143

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