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Mental Addition Worksheet for Class 2 and 3

Mental maths lesson 6: Add 2-digit numbers left to right · Set 8 · 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. 2.64 + 88 =
  3. 3.50 + 39 =
  4. 4.72 + 31 =
  5. 5.25 + 72 =
  6. 6.41 + 64 =
  7. 7.23 + 74 =
  8. 8.57 + 21 =
  9. 9.42 + 22 =
  10. 10.64 + 68 =
  11. 11.22 + 38 =
  12. 12.52 + 16 =
  13. 13.52 + 25 =
  14. 14.52 + 54 =
  15. 15.25 + 37 =
  16. 16.73 + 54 =
  17. 17.45 + 23 =
  18. 18.88 + 29 =
  19. 19.59 + 12 =
  20. 20.29 + 56 =
  21. 21.51 + 25 =
  22. 22.31 + 59 =
  23. 23.21 + 51 =
  24. 24.68 + 22 =
  25. 25.72 + 77 =
  26. 26.59 + 21 =
  27. 27.39 + 21 =
  28. 28.85 + 77 =
  29. 29.61 + 62 =
  30. 30.64 + 47 =
  31. 31.23 + 49 =
  32. 32.57 + 43 =
  33. 33.57 + 18 =
  34. 34.63 + 63 =
  35. 35.23 + 28 =
  36. 36.27 + 77 =
  37. 37.64 + 57 =
  38. 38.34 + 29 =
  39. 39.26 + 73 =
  40. 40.56 + 21 =

Answer key

  1. 166
  2. 152
  3. 89
  4. 103
  5. 97
  6. 105
  7. 97
  8. 78
  9. 64
  10. 132
  11. 60
  12. 68
  13. 77
  14. 106
  15. 62
  16. 127
  17. 68
  18. 117
  19. 71
  20. 85
  21. 76
  22. 90
  23. 72
  24. 90
  25. 149
  26. 80
  27. 60
  28. 162
  29. 123
  30. 111
  31. 72
  32. 100
  33. 75
  34. 126
  35. 51
  36. 104
  37. 121
  38. 63
  39. 99
  40. 77

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