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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 476 · 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. 1.474 + 67 =
  2. 2.454 + 79 =
  3. 3.480 + 48 =
  4. 4.263 + 99 =
  5. 5.57 + 68 =
  6. 6.450 + 97 =
  7. 7.158 + 28 =
  8. 8.278 + 79 =
  9. 9.82 + 58 =
  10. 10.388 + 27 =
  11. 11.196 + 88 =
  12. 12.312 + 37 =
  13. 13.210 + 17 =
  14. 14.134 + 18 =
  15. 15.68 + 68 =
  16. 16.171 + 29 =
  17. 17.389 + 97 =
  18. 18.403 + 58 =
  19. 19.425 + 78 =
  20. 20.499 + 47 =
  21. 21.323 + 89 =
  22. 22.495 + 78 =
  23. 23.67 + 57 =
  24. 24.451 + 58 =
  25. 25.187 + 28 =
  26. 26.183 + 49 =
  27. 27.277 + 47 =
  28. 28.416 + 79 =
  29. 29.112 + 78 =
  30. 30.215 + 38 =
  31. 31.197 + 37 =
  32. 32.327 + 17 =
  33. 33.312 + 67 =
  34. 34.350 + 17 =
  35. 35.327 + 87 =
  36. 36.100 + 78 =
  37. 37.347 + 17 =
  38. 38.183 + 87 =
  39. 39.111 + 87 =
  40. 40.298 + 49 =

Answer key

  1. 541
  2. 533
  3. 528
  4. 362
  5. 125
  6. 547
  7. 186
  8. 357
  9. 140
  10. 415
  11. 284
  12. 349
  13. 227
  14. 152
  15. 136
  16. 200
  17. 486
  18. 461
  19. 503
  20. 546
  21. 412
  22. 573
  23. 124
  24. 509
  25. 215
  26. 232
  27. 324
  28. 495
  29. 190
  30. 253
  31. 234
  32. 344
  33. 379
  34. 367
  35. 414
  36. 178
  37. 364
  38. 270
  39. 198
  40. 347

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