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Mental Addition Worksheet for Class 2 and 3

Mental maths lesson 6: Add 2-digit numbers left to right · Set 578 · 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. 1.43 + 58 =
  2. 2.21 + 58 =
  3. 3.35 + 34 =
  4. 4.59 + 32 =
  5. 5.77 + 79 =
  6. 6.61 + 65 =
  7. 7.83 + 42 =
  8. 8.65 + 59 =
  9. 9.78 + 13 =
  10. 10.36 + 68 =
  11. 11.30 + 59 =
  12. 12.70 + 18 =
  13. 13.74 + 65 =
  14. 14.58 + 72 =
  15. 15.64 + 36 =
  16. 16.25 + 31 =
  17. 17.57 + 86 =
  18. 18.37 + 31 =
  19. 19.25 + 58 =
  20. 20.26 + 41 =
  21. 21.57 + 16 =
  22. 22.64 + 55 =
  23. 23.21 + 22 =
  24. 24.33 + 41 =
  25. 25.50 + 73 =
  26. 26.55 + 18 =
  27. 27.64 + 81 =
  28. 28.26 + 89 =
  29. 29.23 + 82 =
  30. 30.79 + 47 =
  31. 31.65 + 85 =
  32. 32.38 + 89 =
  33. 33.75 + 29 =
  34. 34.86 + 87 =
  35. 35.60 + 51 =
  36. 36.68 + 38 =
  37. 37.59 + 73 =
  38. 38.76 + 54 =
  39. 39.59 + 61 =
  40. 40.43 + 36 =

Answer key

  1. 101
  2. 79
  3. 69
  4. 91
  5. 156
  6. 126
  7. 125
  8. 124
  9. 91
  10. 104
  11. 89
  12. 88
  13. 139
  14. 130
  15. 100
  16. 56
  17. 143
  18. 68
  19. 83
  20. 67
  21. 73
  22. 119
  23. 43
  24. 74
  25. 123
  26. 73
  27. 145
  28. 115
  29. 105
  30. 126
  31. 150
  32. 127
  33. 104
  34. 173
  35. 111
  36. 106
  37. 132
  38. 130
  39. 120
  40. 79

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