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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 494 · 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. 1.429 + 27 =
  2. 2.60 + 58 =
  3. 3.365 + 88 =
  4. 4.467 + 77 =
  5. 5.172 + 77 =
  6. 6.396 + 39 =
  7. 7.286 + 19 =
  8. 8.147 + 28 =
  9. 9.175 + 79 =
  10. 10.157 + 89 =
  11. 11.491 + 57 =
  12. 12.484 + 47 =
  13. 13.115 + 27 =
  14. 14.443 + 38 =
  15. 15.127 + 98 =
  16. 16.74 + 57 =
  17. 17.336 + 38 =
  18. 18.404 + 27 =
  19. 19.390 + 67 =
  20. 20.434 + 48 =
  21. 21.175 + 48 =
  22. 22.299 + 97 =
  23. 23.420 + 59 =
  24. 24.257 + 37 =
  25. 25.37 + 57 =
  26. 26.127 + 47 =
  27. 27.339 + 77 =
  28. 28.211 + 19 =
  29. 29.286 + 18 =
  30. 30.278 + 79 =
  31. 31.379 + 68 =
  32. 32.344 + 97 =
  33. 33.416 + 29 =
  34. 34.329 + 87 =
  35. 35.121 + 87 =
  36. 36.92 + 77 =
  37. 37.95 + 78 =
  38. 38.50 + 47 =
  39. 39.130 + 38 =
  40. 40.242 + 68 =

Answer key

  1. 456
  2. 118
  3. 453
  4. 544
  5. 249
  6. 435
  7. 305
  8. 175
  9. 254
  10. 246
  11. 548
  12. 531
  13. 142
  14. 481
  15. 225
  16. 131
  17. 374
  18. 431
  19. 457
  20. 482
  21. 223
  22. 396
  23. 479
  24. 294
  25. 94
  26. 174
  27. 416
  28. 230
  29. 304
  30. 357
  31. 447
  32. 441
  33. 445
  34. 416
  35. 208
  36. 169
  37. 173
  38. 97
  39. 168
  40. 310

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