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Mental Addition Worksheet for Class 2 and 3

Mental maths lesson 6: Add 2-digit numbers left to right · Set 143 · 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. 1.80 + 41 =
  2. 2.39 + 65 =
  3. 3.26 + 83 =
  4. 4.31 + 51 =
  5. 5.80 + 45 =
  6. 6.66 + 13 =
  7. 7.61 + 81 =
  8. 8.77 + 64 =
  9. 9.76 + 48 =
  10. 10.34 + 61 =
  11. 11.50 + 32 =
  12. 12.28 + 81 =
  13. 13.85 + 85 =
  14. 14.44 + 51 =
  15. 15.87 + 51 =
  16. 16.87 + 85 =
  17. 17.44 + 23 =
  18. 18.59 + 61 =
  19. 19.88 + 42 =
  20. 20.73 + 15 =
  21. 21.54 + 47 =
  22. 22.22 + 71 =
  23. 23.80 + 77 =
  24. 24.80 + 66 =
  25. 25.72 + 88 =
  26. 26.42 + 89 =
  27. 27.54 + 15 =
  28. 28.60 + 71 =
  29. 29.23 + 21 =
  30. 30.26 + 38 =
  31. 31.48 + 32 =
  32. 32.63 + 31 =
  33. 33.36 + 64 =
  34. 34.21 + 45 =
  35. 35.75 + 31 =
  36. 36.62 + 48 =
  37. 37.61 + 76 =
  38. 38.25 + 24 =
  39. 39.23 + 45 =
  40. 40.87 + 24 =

Answer key

  1. 121
  2. 104
  3. 109
  4. 82
  5. 125
  6. 79
  7. 142
  8. 141
  9. 124
  10. 95
  11. 82
  12. 109
  13. 170
  14. 95
  15. 138
  16. 172
  17. 67
  18. 120
  19. 130
  20. 88
  21. 101
  22. 93
  23. 157
  24. 146
  25. 160
  26. 131
  27. 69
  28. 131
  29. 44
  30. 64
  31. 80
  32. 94
  33. 100
  34. 66
  35. 106
  36. 110
  37. 137
  38. 49
  39. 68
  40. 111

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