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Mental Addition Worksheet for Class 2 and 3

Mental maths lesson 6: Add 2-digit numbers left to right · Set 610 · 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. 1.56 + 79 =
  2. 2.69 + 74 =
  3. 3.73 + 51 =
  4. 4.78 + 15 =
  5. 5.42 + 48 =
  6. 6.36 + 15 =
  7. 7.75 + 81 =
  8. 8.58 + 88 =
  9. 9.86 + 31 =
  10. 10.27 + 82 =
  11. 11.84 + 16 =
  12. 12.56 + 71 =
  13. 13.26 + 28 =
  14. 14.37 + 41 =
  15. 15.76 + 65 =
  16. 16.30 + 45 =
  17. 17.38 + 31 =
  18. 18.79 + 21 =
  19. 19.49 + 54 =
  20. 20.70 + 62 =
  21. 21.36 + 38 =
  22. 22.58 + 55 =
  23. 23.60 + 41 =
  24. 24.32 + 51 =
  25. 25.43 + 42 =
  26. 26.70 + 21 =
  27. 27.32 + 62 =
  28. 28.86 + 65 =
  29. 29.40 + 21 =
  30. 30.50 + 14 =
  31. 31.76 + 27 =
  32. 32.24 + 54 =
  33. 33.74 + 18 =
  34. 34.52 + 88 =
  35. 35.75 + 72 =
  36. 36.61 + 32 =
  37. 37.46 + 42 =
  38. 38.59 + 12 =
  39. 39.33 + 48 =
  40. 40.25 + 82 =

Answer key

  1. 135
  2. 143
  3. 124
  4. 93
  5. 90
  6. 51
  7. 156
  8. 146
  9. 117
  10. 109
  11. 100
  12. 127
  13. 54
  14. 78
  15. 141
  16. 75
  17. 69
  18. 100
  19. 103
  20. 132
  21. 74
  22. 113
  23. 101
  24. 83
  25. 85
  26. 91
  27. 94
  28. 151
  29. 61
  30. 64
  31. 103
  32. 78
  33. 92
  34. 140
  35. 147
  36. 93
  37. 88
  38. 71
  39. 81
  40. 107

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