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Mental Addition Worksheet for Class 2 and 3

Mental maths lesson 6: Add 2-digit numbers left to right · Set 999 · 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. 1.87 + 47 =
  2. 2.47 + 18 =
  3. 3.74 + 55 =
  4. 4.53 + 87 =
  5. 5.22 + 82 =
  6. 6.72 + 44 =
  7. 7.58 + 77 =
  8. 8.42 + 72 =
  9. 9.58 + 14 =
  10. 10.22 + 18 =
  11. 11.62 + 41 =
  12. 12.80 + 14 =
  13. 13.53 + 62 =
  14. 14.82 + 33 =
  15. 15.24 + 71 =
  16. 16.52 + 31 =
  17. 17.60 + 16 =
  18. 18.63 + 21 =
  19. 19.42 + 29 =
  20. 20.86 + 29 =
  21. 21.29 + 14 =
  22. 22.65 + 61 =
  23. 23.23 + 21 =
  24. 24.71 + 12 =
  25. 25.51 + 54 =
  26. 26.23 + 34 =
  27. 27.25 + 74 =
  28. 28.82 + 18 =
  29. 29.69 + 32 =
  30. 30.66 + 61 =
  31. 31.87 + 35 =
  32. 32.35 + 33 =
  33. 33.70 + 48 =
  34. 34.86 + 62 =
  35. 35.67 + 72 =
  36. 36.29 + 13 =
  37. 37.39 + 88 =
  38. 38.43 + 45 =
  39. 39.21 + 69 =
  40. 40.80 + 85 =

Answer key

  1. 134
  2. 65
  3. 129
  4. 140
  5. 104
  6. 116
  7. 135
  8. 114
  9. 72
  10. 40
  11. 103
  12. 94
  13. 115
  14. 115
  15. 95
  16. 83
  17. 76
  18. 84
  19. 71
  20. 115
  21. 43
  22. 126
  23. 44
  24. 83
  25. 105
  26. 57
  27. 99
  28. 100
  29. 101
  30. 127
  31. 122
  32. 68
  33. 118
  34. 148
  35. 139
  36. 42
  37. 127
  38. 88
  39. 90
  40. 165

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