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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 754 · 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. 1.275 + 27 =
  2. 2.91 + 89 =
  3. 3.299 + 97 =
  4. 4.415 + 28 =
  5. 5.116 + 27 =
  6. 6.342 + 77 =
  7. 7.486 + 47 =
  8. 8.146 + 37 =
  9. 9.474 + 29 =
  10. 10.297 + 28 =
  11. 11.232 + 59 =
  12. 12.471 + 57 =
  13. 13.30 + 77 =
  14. 14.241 + 48 =
  15. 15.432 + 27 =
  16. 16.208 + 99 =
  17. 17.295 + 17 =
  18. 18.195 + 27 =
  19. 19.136 + 99 =
  20. 20.373 + 19 =
  21. 21.26 + 69 =
  22. 22.362 + 89 =
  23. 23.80 + 49 =
  24. 24.482 + 77 =
  25. 25.335 + 87 =
  26. 26.57 + 29 =
  27. 27.463 + 68 =
  28. 28.438 + 37 =
  29. 29.48 + 39 =
  30. 30.484 + 17 =
  31. 31.495 + 29 =
  32. 32.173 + 48 =
  33. 33.106 + 59 =
  34. 34.76 + 39 =
  35. 35.403 + 37 =
  36. 36.298 + 97 =
  37. 37.271 + 48 =
  38. 38.452 + 79 =
  39. 39.317 + 49 =
  40. 40.421 + 49 =

Answer key

  1. 302
  2. 180
  3. 396
  4. 443
  5. 143
  6. 419
  7. 533
  8. 183
  9. 503
  10. 325
  11. 291
  12. 528
  13. 107
  14. 289
  15. 459
  16. 307
  17. 312
  18. 222
  19. 235
  20. 392
  21. 95
  22. 451
  23. 129
  24. 559
  25. 422
  26. 86
  27. 531
  28. 475
  29. 87
  30. 501
  31. 524
  32. 221
  33. 165
  34. 115
  35. 440
  36. 395
  37. 319
  38. 531
  39. 366
  40. 470

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