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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 143 · 40 questions
TalentJR

The fast method (Round up, then fix): Round the number ending in 7, 8 or 9 up to the next ten: 39 → 40. Add the round number. Take away the extra you added (here 1).

NameDateTime takenScore ___ / 40
  1. 1.157 + 98 =
  2. 2.61 + 97 =
  3. 3.423 + 89 =
  4. 4.41 + 68 =
  5. 5.52 + 28 =
  6. 6.93 + 77 =
  7. 7.493 + 29 =
  8. 8.260 + 17 =
  9. 9.322 + 59 =
  10. 10.111 + 38 =
  11. 11.43 + 58 =
  12. 12.384 + 67 =
  13. 13.197 + 88 =
  14. 14.185 + 48 =
  15. 15.186 + 29 =
  16. 16.428 + 98 =
  17. 17.37 + 98 =
  18. 18.447 + 57 =
  19. 19.173 + 97 =
  20. 20.156 + 17 =
  21. 21.79 + 48 =
  22. 22.286 + 79 =
  23. 23.388 + 69 =
  24. 24.68 + 17 =
  25. 25.488 + 88 =
  26. 26.348 + 48 =
  27. 27.227 + 97 =
  28. 28.241 + 69 =
  29. 29.49 + 37 =
  30. 30.87 + 97 =
  31. 31.43 + 18 =
  32. 32.471 + 59 =
  33. 33.417 + 67 =
  34. 34.107 + 37 =
  35. 35.73 + 67 =
  36. 36.90 + 39 =
  37. 37.136 + 77 =
  38. 38.472 + 19 =
  39. 39.89 + 37 =
  40. 40.110 + 49 =

Answer key

  1. 255
  2. 158
  3. 512
  4. 109
  5. 80
  6. 170
  7. 522
  8. 277
  9. 381
  10. 149
  11. 101
  12. 451
  13. 285
  14. 233
  15. 215
  16. 526
  17. 135
  18. 504
  19. 270
  20. 173
  21. 127
  22. 365
  23. 457
  24. 85
  25. 576
  26. 396
  27. 324
  28. 310
  29. 86
  30. 184
  31. 61
  32. 530
  33. 484
  34. 144
  35. 140
  36. 129
  37. 213
  38. 491
  39. 126
  40. 159

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