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Mental Addition Worksheet for Class 2 and 3

Mental maths lesson 6: Add 2-digit numbers left to right · Set 155 · 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. 1.31 + 51 =
  2. 2.81 + 81 =
  3. 3.67 + 49 =
  4. 4.47 + 86 =
  5. 5.56 + 59 =
  6. 6.43 + 21 =
  7. 7.60 + 74 =
  8. 8.38 + 82 =
  9. 9.25 + 22 =
  10. 10.43 + 83 =
  11. 11.43 + 63 =
  12. 12.30 + 15 =
  13. 13.63 + 25 =
  14. 14.71 + 81 =
  15. 15.88 + 54 =
  16. 16.46 + 82 =
  17. 17.33 + 28 =
  18. 18.71 + 45 =
  19. 19.35 + 82 =
  20. 20.72 + 81 =
  21. 21.38 + 31 =
  22. 22.43 + 49 =
  23. 23.72 + 54 =
  24. 24.29 + 12 =
  25. 25.57 + 21 =
  26. 26.40 + 32 =
  27. 27.73 + 82 =
  28. 28.64 + 21 =
  29. 29.24 + 52 =
  30. 30.66 + 43 =
  31. 31.86 + 38 =
  32. 32.86 + 84 =
  33. 33.59 + 31 =
  34. 34.85 + 18 =
  35. 35.45 + 55 =
  36. 36.21 + 21 =
  37. 37.29 + 25 =
  38. 38.45 + 18 =
  39. 39.37 + 89 =
  40. 40.28 + 39 =

Answer key

  1. 82
  2. 162
  3. 116
  4. 133
  5. 115
  6. 64
  7. 134
  8. 120
  9. 47
  10. 126
  11. 106
  12. 45
  13. 88
  14. 152
  15. 142
  16. 128
  17. 61
  18. 116
  19. 117
  20. 153
  21. 69
  22. 92
  23. 126
  24. 41
  25. 78
  26. 72
  27. 155
  28. 85
  29. 76
  30. 109
  31. 124
  32. 170
  33. 90
  34. 103
  35. 100
  36. 42
  37. 54
  38. 63
  39. 126
  40. 67

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