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Mental Addition Worksheet for Class 2 and 3

Mental maths lesson 6: Add 2-digit numbers left to right · Set 399 · 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. 1.40 + 48 =
  2. 2.39 + 62 =
  3. 3.41 + 87 =
  4. 4.49 + 18 =
  5. 5.23 + 31 =
  6. 6.47 + 74 =
  7. 7.64 + 15 =
  8. 8.71 + 16 =
  9. 9.30 + 21 =
  10. 10.81 + 56 =
  11. 11.53 + 49 =
  12. 12.25 + 47 =
  13. 13.75 + 41 =
  14. 14.88 + 51 =
  15. 15.73 + 47 =
  16. 16.42 + 32 =
  17. 17.42 + 75 =
  18. 18.80 + 26 =
  19. 19.85 + 24 =
  20. 20.83 + 55 =
  21. 21.37 + 44 =
  22. 22.72 + 27 =
  23. 23.27 + 42 =
  24. 24.60 + 78 =
  25. 25.33 + 53 =
  26. 26.64 + 73 =
  27. 27.57 + 28 =
  28. 28.49 + 13 =
  29. 29.37 + 61 =
  30. 30.69 + 19 =
  31. 31.57 + 79 =
  32. 32.50 + 48 =
  33. 33.80 + 71 =
  34. 34.81 + 23 =
  35. 35.21 + 23 =
  36. 36.28 + 69 =
  37. 37.72 + 52 =
  38. 38.42 + 28 =
  39. 39.22 + 44 =
  40. 40.69 + 69 =

Answer key

  1. 88
  2. 101
  3. 128
  4. 67
  5. 54
  6. 121
  7. 79
  8. 87
  9. 51
  10. 137
  11. 102
  12. 72
  13. 116
  14. 139
  15. 120
  16. 74
  17. 117
  18. 106
  19. 109
  20. 138
  21. 81
  22. 99
  23. 69
  24. 138
  25. 86
  26. 137
  27. 85
  28. 62
  29. 98
  30. 88
  31. 136
  32. 98
  33. 151
  34. 104
  35. 44
  36. 97
  37. 124
  38. 70
  39. 66
  40. 138

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