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Mental Addition Worksheet for Class 2 and 3

Mental maths lesson 6: Add 2-digit numbers left to right · Set 171 · 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. 1.39 + 39 =
  2. 2.73 + 47 =
  3. 3.34 + 45 =
  4. 4.39 + 89 =
  5. 5.23 + 21 =
  6. 6.65 + 85 =
  7. 7.86 + 55 =
  8. 8.81 + 23 =
  9. 9.74 + 51 =
  10. 10.36 + 38 =
  11. 11.53 + 22 =
  12. 12.35 + 46 =
  13. 13.32 + 49 =
  14. 14.71 + 49 =
  15. 15.32 + 22 =
  16. 16.28 + 72 =
  17. 17.38 + 12 =
  18. 18.34 + 72 =
  19. 19.77 + 79 =
  20. 20.56 + 16 =
  21. 21.33 + 88 =
  22. 22.41 + 81 =
  23. 23.27 + 81 =
  24. 24.51 + 15 =
  25. 25.53 + 81 =
  26. 26.51 + 63 =
  27. 27.87 + 46 =
  28. 28.85 + 39 =
  29. 29.30 + 66 =
  30. 30.76 + 73 =
  31. 31.33 + 65 =
  32. 32.65 + 12 =
  33. 33.47 + 51 =
  34. 34.40 + 27 =
  35. 35.38 + 55 =
  36. 36.29 + 51 =
  37. 37.46 + 54 =
  38. 38.86 + 39 =
  39. 39.26 + 71 =
  40. 40.21 + 77 =

Answer key

  1. 78
  2. 120
  3. 79
  4. 128
  5. 44
  6. 150
  7. 141
  8. 104
  9. 125
  10. 74
  11. 75
  12. 81
  13. 81
  14. 120
  15. 54
  16. 100
  17. 50
  18. 106
  19. 156
  20. 72
  21. 121
  22. 122
  23. 108
  24. 66
  25. 134
  26. 114
  27. 133
  28. 124
  29. 96
  30. 149
  31. 98
  32. 77
  33. 98
  34. 67
  35. 93
  36. 80
  37. 100
  38. 125
  39. 97
  40. 98

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