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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 141 · 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. 1.278 + 79 =
  2. 2.295 + 89 =
  3. 3.433 + 29 =
  4. 4.247 + 17 =
  5. 5.348 + 37 =
  6. 6.453 + 77 =
  7. 7.356 + 77 =
  8. 8.73 + 98 =
  9. 9.296 + 68 =
  10. 10.109 + 49 =
  11. 11.238 + 69 =
  12. 12.323 + 59 =
  13. 13.73 + 29 =
  14. 14.152 + 69 =
  15. 15.459 + 19 =
  16. 16.468 + 69 =
  17. 17.395 + 77 =
  18. 18.231 + 47 =
  19. 19.161 + 97 =
  20. 20.425 + 39 =
  21. 21.433 + 98 =
  22. 22.229 + 27 =
  23. 23.122 + 77 =
  24. 24.327 + 18 =
  25. 25.90 + 98 =
  26. 26.233 + 98 =
  27. 27.250 + 38 =
  28. 28.140 + 19 =
  29. 29.214 + 39 =
  30. 30.250 + 59 =
  31. 31.467 + 39 =
  32. 32.60 + 48 =
  33. 33.172 + 49 =
  34. 34.239 + 88 =
  35. 35.340 + 17 =
  36. 36.483 + 19 =
  37. 37.273 + 18 =
  38. 38.257 + 29 =
  39. 39.94 + 97 =
  40. 40.90 + 98 =

Answer key

  1. 357
  2. 384
  3. 462
  4. 264
  5. 385
  6. 530
  7. 433
  8. 171
  9. 364
  10. 158
  11. 307
  12. 382
  13. 102
  14. 221
  15. 478
  16. 537
  17. 472
  18. 278
  19. 258
  20. 464
  21. 531
  22. 256
  23. 199
  24. 345
  25. 188
  26. 331
  27. 288
  28. 159
  29. 253
  30. 309
  31. 506
  32. 108
  33. 221
  34. 327
  35. 357
  36. 502
  37. 291
  38. 286
  39. 191
  40. 188

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