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Mental Addition Worksheet for Class 2 and 3

Mental maths lesson 6: Add 2-digit numbers left to right · Set 373 · 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 + 68 =
  2. 2.36 + 15 =
  3. 3.56 + 55 =
  4. 4.66 + 38 =
  5. 5.40 + 78 =
  6. 6.63 + 31 =
  7. 7.78 + 37 =
  8. 8.57 + 34 =
  9. 9.78 + 81 =
  10. 10.36 + 83 =
  11. 11.28 + 81 =
  12. 12.77 + 52 =
  13. 13.30 + 36 =
  14. 14.28 + 31 =
  15. 15.36 + 22 =
  16. 16.49 + 49 =
  17. 17.76 + 38 =
  18. 18.85 + 65 =
  19. 19.38 + 21 =
  20. 20.58 + 27 =
  21. 21.68 + 81 =
  22. 22.75 + 34 =
  23. 23.71 + 41 =
  24. 24.44 + 69 =
  25. 25.81 + 42 =
  26. 26.60 + 76 =
  27. 27.57 + 42 =
  28. 28.55 + 76 =
  29. 29.38 + 63 =
  30. 30.34 + 44 =
  31. 31.33 + 37 =
  32. 32.66 + 88 =
  33. 33.26 + 41 =
  34. 34.23 + 31 =
  35. 35.59 + 77 =
  36. 36.45 + 71 =
  37. 37.67 + 44 =
  38. 38.29 + 55 =
  39. 39.41 + 18 =
  40. 40.39 + 36 =

Answer key

  1. 145
  2. 51
  3. 111
  4. 104
  5. 118
  6. 94
  7. 115
  8. 91
  9. 159
  10. 119
  11. 109
  12. 129
  13. 66
  14. 59
  15. 58
  16. 98
  17. 114
  18. 150
  19. 59
  20. 85
  21. 149
  22. 109
  23. 112
  24. 113
  25. 123
  26. 136
  27. 99
  28. 131
  29. 101
  30. 78
  31. 70
  32. 154
  33. 67
  34. 54
  35. 136
  36. 116
  37. 111
  38. 84
  39. 59
  40. 75

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