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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 771 · 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. 1.251 + 88 =
  2. 2.101 + 78 =
  3. 3.440 + 29 =
  4. 4.86 + 47 =
  5. 5.371 + 89 =
  6. 6.308 + 37 =
  7. 7.127 + 77 =
  8. 8.410 + 38 =
  9. 9.364 + 77 =
  10. 10.134 + 87 =
  11. 11.447 + 59 =
  12. 12.83 + 39 =
  13. 13.227 + 57 =
  14. 14.156 + 47 =
  15. 15.177 + 98 =
  16. 16.294 + 58 =
  17. 17.93 + 48 =
  18. 18.315 + 97 =
  19. 19.437 + 98 =
  20. 20.96 + 27 =
  21. 21.429 + 57 =
  22. 22.364 + 58 =
  23. 23.238 + 99 =
  24. 24.424 + 17 =
  25. 25.157 + 38 =
  26. 26.307 + 97 =
  27. 27.220 + 98 =
  28. 28.309 + 18 =
  29. 29.56 + 88 =
  30. 30.370 + 17 =
  31. 31.177 + 38 =
  32. 32.303 + 69 =
  33. 33.377 + 49 =
  34. 34.368 + 88 =
  35. 35.271 + 88 =
  36. 36.236 + 49 =
  37. 37.72 + 18 =
  38. 38.80 + 38 =
  39. 39.415 + 67 =
  40. 40.76 + 57 =

Answer key

  1. 339
  2. 179
  3. 469
  4. 133
  5. 460
  6. 345
  7. 204
  8. 448
  9. 441
  10. 221
  11. 506
  12. 122
  13. 284
  14. 203
  15. 275
  16. 352
  17. 141
  18. 412
  19. 535
  20. 123
  21. 486
  22. 422
  23. 337
  24. 441
  25. 195
  26. 404
  27. 318
  28. 327
  29. 144
  30. 387
  31. 215
  32. 372
  33. 426
  34. 456
  35. 359
  36. 285
  37. 90
  38. 118
  39. 482
  40. 133

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