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Mental Addition Worksheet for Class 2 and 3

Mental maths lesson 6: Add 2-digit numbers left to right · Set 149 · 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. 1.51 + 48 =
  2. 2.34 + 51 =
  3. 3.56 + 71 =
  4. 4.79 + 16 =
  5. 5.51 + 23 =
  6. 6.26 + 17 =
  7. 7.53 + 53 =
  8. 8.39 + 57 =
  9. 9.34 + 31 =
  10. 10.78 + 33 =
  11. 11.65 + 81 =
  12. 12.87 + 17 =
  13. 13.49 + 17 =
  14. 14.77 + 14 =
  15. 15.29 + 49 =
  16. 16.29 + 87 =
  17. 17.66 + 18 =
  18. 18.50 + 66 =
  19. 19.77 + 41 =
  20. 20.46 + 59 =
  21. 21.71 + 43 =
  22. 22.22 + 27 =
  23. 23.42 + 19 =
  24. 24.64 + 68 =
  25. 25.32 + 12 =
  26. 26.74 + 61 =
  27. 27.24 + 31 =
  28. 28.65 + 83 =
  29. 29.32 + 29 =
  30. 30.69 + 59 =
  31. 31.89 + 43 =
  32. 32.31 + 41 =
  33. 33.85 + 63 =
  34. 34.26 + 89 =
  35. 35.68 + 51 =
  36. 36.34 + 44 =
  37. 37.75 + 49 =
  38. 38.57 + 33 =
  39. 39.30 + 26 =
  40. 40.37 + 23 =

Answer key

  1. 99
  2. 85
  3. 127
  4. 95
  5. 74
  6. 43
  7. 106
  8. 96
  9. 65
  10. 111
  11. 146
  12. 104
  13. 66
  14. 91
  15. 78
  16. 116
  17. 84
  18. 116
  19. 118
  20. 105
  21. 114
  22. 49
  23. 61
  24. 132
  25. 44
  26. 135
  27. 55
  28. 148
  29. 61
  30. 128
  31. 132
  32. 72
  33. 148
  34. 115
  35. 119
  36. 78
  37. 124
  38. 90
  39. 56
  40. 60

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