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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 553 · 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. 1.137 + 89 =
  2. 2.302 + 28 =
  3. 3.369 + 89 =
  4. 4.453 + 38 =
  5. 5.489 + 48 =
  6. 6.483 + 49 =
  7. 7.488 + 48 =
  8. 8.137 + 59 =
  9. 9.244 + 87 =
  10. 10.382 + 79 =
  11. 11.473 + 39 =
  12. 12.264 + 39 =
  13. 13.83 + 87 =
  14. 14.129 + 57 =
  15. 15.331 + 38 =
  16. 16.376 + 27 =
  17. 17.113 + 59 =
  18. 18.315 + 68 =
  19. 19.437 + 49 =
  20. 20.344 + 79 =
  21. 21.471 + 57 =
  22. 22.458 + 19 =
  23. 23.226 + 59 =
  24. 24.51 + 27 =
  25. 25.415 + 89 =
  26. 26.337 + 27 =
  27. 27.133 + 59 =
  28. 28.389 + 28 =
  29. 29.238 + 18 =
  30. 30.335 + 99 =
  31. 31.128 + 27 =
  32. 32.168 + 57 =
  33. 33.239 + 29 =
  34. 34.106 + 77 =
  35. 35.138 + 79 =
  36. 36.26 + 27 =
  37. 37.428 + 67 =
  38. 38.358 + 19 =
  39. 39.310 + 19 =
  40. 40.47 + 19 =

Answer key

  1. 226
  2. 330
  3. 458
  4. 491
  5. 537
  6. 532
  7. 536
  8. 196
  9. 331
  10. 461
  11. 512
  12. 303
  13. 170
  14. 186
  15. 369
  16. 403
  17. 172
  18. 383
  19. 486
  20. 423
  21. 528
  22. 477
  23. 285
  24. 78
  25. 504
  26. 364
  27. 192
  28. 417
  29. 256
  30. 434
  31. 155
  32. 225
  33. 268
  34. 183
  35. 217
  36. 53
  37. 495
  38. 377
  39. 329
  40. 66

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