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Mental Addition Worksheet for Class 2 and 3

Mental maths lesson 6: Add 2-digit numbers left to right · Set 178 · 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. 1.88 + 78 =
  2. 2.21 + 78 =
  3. 3.45 + 68 =
  4. 4.30 + 36 =
  5. 5.37 + 29 =
  6. 6.58 + 31 =
  7. 7.46 + 86 =
  8. 8.85 + 62 =
  9. 9.88 + 77 =
  10. 10.86 + 87 =
  11. 11.34 + 17 =
  12. 12.41 + 74 =
  13. 13.32 + 44 =
  14. 14.89 + 14 =
  15. 15.50 + 17 =
  16. 16.55 + 39 =
  17. 17.24 + 27 =
  18. 18.88 + 24 =
  19. 19.37 + 89 =
  20. 20.71 + 51 =
  21. 21.72 + 21 =
  22. 22.61 + 51 =
  23. 23.26 + 24 =
  24. 24.23 + 78 =
  25. 25.66 + 62 =
  26. 26.35 + 29 =
  27. 27.72 + 88 =
  28. 28.59 + 45 =
  29. 29.70 + 26 =
  30. 30.37 + 13 =
  31. 31.73 + 41 =
  32. 32.83 + 27 =
  33. 33.42 + 33 =
  34. 34.24 + 24 =
  35. 35.59 + 81 =
  36. 36.75 + 35 =
  37. 37.52 + 44 =
  38. 38.67 + 85 =
  39. 39.64 + 57 =
  40. 40.40 + 55 =

Answer key

  1. 166
  2. 99
  3. 113
  4. 66
  5. 66
  6. 89
  7. 132
  8. 147
  9. 165
  10. 173
  11. 51
  12. 115
  13. 76
  14. 103
  15. 67
  16. 94
  17. 51
  18. 112
  19. 126
  20. 122
  21. 93
  22. 112
  23. 50
  24. 101
  25. 128
  26. 64
  27. 160
  28. 104
  29. 96
  30. 50
  31. 114
  32. 110
  33. 75
  34. 48
  35. 140
  36. 110
  37. 96
  38. 152
  39. 121
  40. 95

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