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Mental Addition Worksheet for Class 2 and 3

Mental maths lesson 6: Add 2-digit numbers left to right · Set 421 · 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. 1.62 + 86 =
  2. 2.23 + 21 =
  3. 3.69 + 29 =
  4. 4.34 + 52 =
  5. 5.77 + 41 =
  6. 6.36 + 72 =
  7. 7.48 + 76 =
  8. 8.72 + 21 =
  9. 9.27 + 76 =
  10. 10.58 + 84 =
  11. 11.70 + 66 =
  12. 12.51 + 21 =
  13. 13.44 + 75 =
  14. 14.75 + 43 =
  15. 15.76 + 68 =
  16. 16.87 + 88 =
  17. 17.63 + 52 =
  18. 18.57 + 28 =
  19. 19.65 + 81 =
  20. 20.51 + 51 =
  21. 21.30 + 84 =
  22. 22.36 + 61 =
  23. 23.54 + 28 =
  24. 24.35 + 41 =
  25. 25.51 + 39 =
  26. 26.40 + 44 =
  27. 27.84 + 79 =
  28. 28.54 + 38 =
  29. 29.71 + 64 =
  30. 30.89 + 44 =
  31. 31.52 + 71 =
  32. 32.21 + 24 =
  33. 33.42 + 29 =
  34. 34.35 + 61 =
  35. 35.69 + 33 =
  36. 36.87 + 87 =
  37. 37.24 + 59 =
  38. 38.52 + 78 =
  39. 39.40 + 77 =
  40. 40.33 + 61 =

Answer key

  1. 148
  2. 44
  3. 98
  4. 86
  5. 118
  6. 108
  7. 124
  8. 93
  9. 103
  10. 142
  11. 136
  12. 72
  13. 119
  14. 118
  15. 144
  16. 175
  17. 115
  18. 85
  19. 146
  20. 102
  21. 114
  22. 97
  23. 82
  24. 76
  25. 90
  26. 84
  27. 163
  28. 92
  29. 135
  30. 133
  31. 123
  32. 45
  33. 71
  34. 96
  35. 102
  36. 174
  37. 83
  38. 130
  39. 117
  40. 94

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