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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 597 · 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. 1.229 + 77 =
  2. 2.456 + 18 =
  3. 3.70 + 17 =
  4. 4.235 + 19 =
  5. 5.181 + 88 =
  6. 6.145 + 38 =
  7. 7.51 + 17 =
  8. 8.466 + 49 =
  9. 9.380 + 47 =
  10. 10.184 + 38 =
  11. 11.222 + 89 =
  12. 12.121 + 18 =
  13. 13.290 + 47 =
  14. 14.490 + 28 =
  15. 15.178 + 87 =
  16. 16.374 + 87 =
  17. 17.174 + 27 =
  18. 18.451 + 78 =
  19. 19.67 + 27 =
  20. 20.368 + 27 =
  21. 21.200 + 17 =
  22. 22.36 + 67 =
  23. 23.301 + 48 =
  24. 24.316 + 97 =
  25. 25.491 + 18 =
  26. 26.53 + 47 =
  27. 27.307 + 48 =
  28. 28.36 + 99 =
  29. 29.466 + 99 =
  30. 30.325 + 57 =
  31. 31.89 + 37 =
  32. 32.113 + 48 =
  33. 33.233 + 18 =
  34. 34.369 + 27 =
  35. 35.473 + 99 =
  36. 36.358 + 67 =
  37. 37.308 + 18 =
  38. 38.419 + 99 =
  39. 39.53 + 89 =
  40. 40.62 + 37 =

Answer key

  1. 306
  2. 474
  3. 87
  4. 254
  5. 269
  6. 183
  7. 68
  8. 515
  9. 427
  10. 222
  11. 311
  12. 139
  13. 337
  14. 518
  15. 265
  16. 461
  17. 201
  18. 529
  19. 94
  20. 395
  21. 217
  22. 103
  23. 349
  24. 413
  25. 509
  26. 100
  27. 355
  28. 135
  29. 565
  30. 382
  31. 126
  32. 161
  33. 251
  34. 396
  35. 572
  36. 425
  37. 326
  38. 518
  39. 142
  40. 99

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