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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 371 · 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. 1.119 + 68 =
  2. 2.313 + 79 =
  3. 3.436 + 59 =
  4. 4.492 + 57 =
  5. 5.90 + 97 =
  6. 6.232 + 77 =
  7. 7.388 + 29 =
  8. 8.331 + 39 =
  9. 9.397 + 28 =
  10. 10.364 + 18 =
  11. 11.291 + 89 =
  12. 12.136 + 68 =
  13. 13.346 + 17 =
  14. 14.380 + 77 =
  15. 15.496 + 67 =
  16. 16.111 + 17 =
  17. 17.451 + 69 =
  18. 18.44 + 98 =
  19. 19.277 + 88 =
  20. 20.84 + 19 =
  21. 21.64 + 98 =
  22. 22.258 + 17 =
  23. 23.172 + 27 =
  24. 24.91 + 98 =
  25. 25.296 + 69 =
  26. 26.109 + 59 =
  27. 27.56 + 49 =
  28. 28.472 + 78 =
  29. 29.45 + 48 =
  30. 30.62 + 99 =
  31. 31.180 + 99 =
  32. 32.87 + 47 =
  33. 33.267 + 97 =
  34. 34.202 + 57 =
  35. 35.183 + 99 =
  36. 36.113 + 87 =
  37. 37.344 + 87 =
  38. 38.323 + 28 =
  39. 39.51 + 29 =
  40. 40.399 + 58 =

Answer key

  1. 187
  2. 392
  3. 495
  4. 549
  5. 187
  6. 309
  7. 417
  8. 370
  9. 425
  10. 382
  11. 380
  12. 204
  13. 363
  14. 457
  15. 563
  16. 128
  17. 520
  18. 142
  19. 365
  20. 103
  21. 162
  22. 275
  23. 199
  24. 189
  25. 365
  26. 168
  27. 105
  28. 550
  29. 93
  30. 161
  31. 279
  32. 134
  33. 364
  34. 259
  35. 282
  36. 200
  37. 431
  38. 351
  39. 80
  40. 457

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