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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 786 · 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. 1.300 + 19 =
  2. 2.387 + 77 =
  3. 3.143 + 29 =
  4. 4.440 + 17 =
  5. 5.34 + 18 =
  6. 6.74 + 59 =
  7. 7.455 + 99 =
  8. 8.81 + 78 =
  9. 9.168 + 17 =
  10. 10.300 + 79 =
  11. 11.454 + 17 =
  12. 12.200 + 68 =
  13. 13.204 + 58 =
  14. 14.226 + 87 =
  15. 15.378 + 69 =
  16. 16.376 + 38 =
  17. 17.51 + 39 =
  18. 18.322 + 39 =
  19. 19.355 + 67 =
  20. 20.376 + 98 =
  21. 21.299 + 19 =
  22. 22.40 + 59 =
  23. 23.263 + 98 =
  24. 24.353 + 17 =
  25. 25.132 + 37 =
  26. 26.436 + 69 =
  27. 27.270 + 47 =
  28. 28.140 + 47 =
  29. 29.32 + 87 =
  30. 30.266 + 88 =
  31. 31.185 + 97 =
  32. 32.110 + 69 =
  33. 33.130 + 97 =
  34. 34.222 + 67 =
  35. 35.88 + 97 =
  36. 36.167 + 29 =
  37. 37.453 + 78 =
  38. 38.417 + 98 =
  39. 39.421 + 97 =
  40. 40.153 + 87 =

Answer key

  1. 319
  2. 464
  3. 172
  4. 457
  5. 52
  6. 133
  7. 554
  8. 159
  9. 185
  10. 379
  11. 471
  12. 268
  13. 262
  14. 313
  15. 447
  16. 414
  17. 90
  18. 361
  19. 422
  20. 474
  21. 318
  22. 99
  23. 361
  24. 370
  25. 169
  26. 505
  27. 317
  28. 187
  29. 119
  30. 354
  31. 282
  32. 179
  33. 227
  34. 289
  35. 185
  36. 196
  37. 531
  38. 515
  39. 518
  40. 240

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