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Mental Addition Worksheet for Class 2 and 3

Mental maths lesson 6: Add 2-digit numbers left to right · Set 163 · 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. 1.45 + 12 =
  2. 2.55 + 63 =
  3. 3.26 + 64 =
  4. 4.34 + 89 =
  5. 5.74 + 18 =
  6. 6.88 + 74 =
  7. 7.54 + 89 =
  8. 8.23 + 51 =
  9. 9.74 + 78 =
  10. 10.31 + 29 =
  11. 11.40 + 38 =
  12. 12.86 + 29 =
  13. 13.42 + 26 =
  14. 14.84 + 51 =
  15. 15.87 + 77 =
  16. 16.78 + 29 =
  17. 17.37 + 89 =
  18. 18.76 + 19 =
  19. 19.21 + 31 =
  20. 20.55 + 31 =
  21. 21.50 + 51 =
  22. 22.39 + 22 =
  23. 23.37 + 41 =
  24. 24.24 + 75 =
  25. 25.71 + 47 =
  26. 26.23 + 39 =
  27. 27.29 + 73 =
  28. 28.68 + 18 =
  29. 29.65 + 29 =
  30. 30.48 + 77 =
  31. 31.49 + 55 =
  32. 32.34 + 74 =
  33. 33.71 + 25 =
  34. 34.84 + 12 =
  35. 35.79 + 24 =
  36. 36.60 + 66 =
  37. 37.39 + 61 =
  38. 38.46 + 87 =
  39. 39.74 + 34 =
  40. 40.87 + 39 =

Answer key

  1. 57
  2. 118
  3. 90
  4. 123
  5. 92
  6. 162
  7. 143
  8. 74
  9. 152
  10. 60
  11. 78
  12. 115
  13. 68
  14. 135
  15. 164
  16. 107
  17. 126
  18. 95
  19. 52
  20. 86
  21. 101
  22. 61
  23. 78
  24. 99
  25. 118
  26. 62
  27. 102
  28. 86
  29. 94
  30. 125
  31. 104
  32. 108
  33. 96
  34. 96
  35. 103
  36. 126
  37. 100
  38. 133
  39. 108
  40. 126

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