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Mental Addition Worksheet for Class 2 and 3

Mental maths lesson 6: Add 2-digit numbers left to right · Set 645 · 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 + 13 =
  2. 2.34 + 61 =
  3. 3.66 + 14 =
  4. 4.72 + 35 =
  5. 5.59 + 48 =
  6. 6.38 + 28 =
  7. 7.85 + 64 =
  8. 8.32 + 81 =
  9. 9.62 + 19 =
  10. 10.25 + 48 =
  11. 11.42 + 76 =
  12. 12.63 + 33 =
  13. 13.37 + 18 =
  14. 14.34 + 82 =
  15. 15.46 + 83 =
  16. 16.76 + 61 =
  17. 17.22 + 85 =
  18. 18.38 + 31 =
  19. 19.23 + 64 =
  20. 20.34 + 44 =
  21. 21.21 + 21 =
  22. 22.73 + 73 =
  23. 23.64 + 15 =
  24. 24.79 + 41 =
  25. 25.44 + 48 =
  26. 26.56 + 43 =
  27. 27.54 + 45 =
  28. 28.62 + 74 =
  29. 29.56 + 64 =
  30. 30.80 + 18 =
  31. 31.79 + 69 =
  32. 32.24 + 18 =
  33. 33.77 + 19 =
  34. 34.87 + 41 =
  35. 35.56 + 81 =
  36. 36.31 + 49 =
  37. 37.60 + 68 =
  38. 38.69 + 29 =
  39. 39.27 + 44 =
  40. 40.73 + 44 =

Answer key

  1. 53
  2. 95
  3. 80
  4. 107
  5. 107
  6. 66
  7. 149
  8. 113
  9. 81
  10. 73
  11. 118
  12. 96
  13. 55
  14. 116
  15. 129
  16. 137
  17. 107
  18. 69
  19. 87
  20. 78
  21. 42
  22. 146
  23. 79
  24. 120
  25. 92
  26. 99
  27. 99
  28. 136
  29. 120
  30. 98
  31. 148
  32. 42
  33. 96
  34. 128
  35. 137
  36. 80
  37. 128
  38. 98
  39. 71
  40. 117

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