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Mental Addition Worksheet for Class 2 and 3

Mental maths lesson 6: Add 2-digit numbers left to right · Set 470 · 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. 1.44 + 79 =
  2. 2.36 + 53 =
  3. 3.37 + 53 =
  4. 4.23 + 56 =
  5. 5.30 + 37 =
  6. 6.54 + 31 =
  7. 7.46 + 71 =
  8. 8.59 + 83 =
  9. 9.59 + 48 =
  10. 10.35 + 79 =
  11. 11.57 + 77 =
  12. 12.35 + 21 =
  13. 13.66 + 84 =
  14. 14.68 + 84 =
  15. 15.43 + 33 =
  16. 16.77 + 27 =
  17. 17.61 + 45 =
  18. 18.67 + 34 =
  19. 19.39 + 74 =
  20. 20.51 + 41 =
  21. 21.25 + 19 =
  22. 22.83 + 57 =
  23. 23.51 + 35 =
  24. 24.73 + 26 =
  25. 25.24 + 31 =
  26. 26.58 + 62 =
  27. 27.65 + 33 =
  28. 28.53 + 79 =
  29. 29.35 + 51 =
  30. 30.80 + 71 =
  31. 31.76 + 32 =
  32. 32.67 + 21 =
  33. 33.68 + 69 =
  34. 34.39 + 53 =
  35. 35.55 + 39 =
  36. 36.32 + 71 =
  37. 37.78 + 17 =
  38. 38.75 + 67 =
  39. 39.77 + 51 =
  40. 40.55 + 37 =

Answer key

  1. 123
  2. 89
  3. 90
  4. 79
  5. 67
  6. 85
  7. 117
  8. 142
  9. 107
  10. 114
  11. 134
  12. 56
  13. 150
  14. 152
  15. 76
  16. 104
  17. 106
  18. 101
  19. 113
  20. 92
  21. 44
  22. 140
  23. 86
  24. 99
  25. 55
  26. 120
  27. 98
  28. 132
  29. 86
  30. 151
  31. 108
  32. 88
  33. 137
  34. 92
  35. 94
  36. 103
  37. 95
  38. 142
  39. 128
  40. 92

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