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Mental Addition Worksheet for Class 2 and 3

Mental maths lesson 6: Add 2-digit numbers left to right · Set 301 · 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. 1.74 + 69 =
  2. 2.89 + 61 =
  3. 3.63 + 69 =
  4. 4.42 + 26 =
  5. 5.89 + 41 =
  6. 6.21 + 53 =
  7. 7.54 + 21 =
  8. 8.88 + 71 =
  9. 9.32 + 71 =
  10. 10.49 + 52 =
  11. 11.51 + 53 =
  12. 12.57 + 17 =
  13. 13.39 + 43 =
  14. 14.87 + 73 =
  15. 15.60 + 65 =
  16. 16.41 + 68 =
  17. 17.34 + 51 =
  18. 18.65 + 31 =
  19. 19.69 + 61 =
  20. 20.58 + 14 =
  21. 21.73 + 56 =
  22. 22.45 + 65 =
  23. 23.31 + 21 =
  24. 24.28 + 75 =
  25. 25.67 + 26 =
  26. 26.85 + 16 =
  27. 27.39 + 72 =
  28. 28.45 + 24 =
  29. 29.62 + 23 =
  30. 30.54 + 25 =
  31. 31.23 + 87 =
  32. 32.21 + 45 =
  33. 33.62 + 74 =
  34. 34.42 + 78 =
  35. 35.86 + 29 =
  36. 36.85 + 47 =
  37. 37.22 + 31 =
  38. 38.81 + 58 =
  39. 39.21 + 51 =
  40. 40.71 + 51 =

Answer key

  1. 143
  2. 150
  3. 132
  4. 68
  5. 130
  6. 74
  7. 75
  8. 159
  9. 103
  10. 101
  11. 104
  12. 74
  13. 82
  14. 160
  15. 125
  16. 109
  17. 85
  18. 96
  19. 130
  20. 72
  21. 129
  22. 110
  23. 52
  24. 103
  25. 93
  26. 101
  27. 111
  28. 69
  29. 85
  30. 79
  31. 110
  32. 66
  33. 136
  34. 120
  35. 115
  36. 132
  37. 53
  38. 139
  39. 72
  40. 122

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