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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 314 · 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. 1.172 + 47 =
  2. 2.371 + 27 =
  3. 3.150 + 18 =
  4. 4.310 + 27 =
  5. 5.125 + 89 =
  6. 6.464 + 97 =
  7. 7.445 + 77 =
  8. 8.120 + 28 =
  9. 9.449 + 59 =
  10. 10.86 + 98 =
  11. 11.297 + 49 =
  12. 12.370 + 28 =
  13. 13.194 + 97 =
  14. 14.220 + 18 =
  15. 15.476 + 59 =
  16. 16.342 + 98 =
  17. 17.108 + 48 =
  18. 18.397 + 27 =
  19. 19.206 + 27 =
  20. 20.68 + 57 =
  21. 21.455 + 97 =
  22. 22.315 + 39 =
  23. 23.368 + 97 =
  24. 24.67 + 57 =
  25. 25.152 + 97 =
  26. 26.290 + 49 =
  27. 27.202 + 37 =
  28. 28.43 + 68 =
  29. 29.410 + 48 =
  30. 30.113 + 79 =
  31. 31.299 + 17 =
  32. 32.339 + 67 =
  33. 33.149 + 78 =
  34. 34.226 + 97 =
  35. 35.362 + 29 =
  36. 36.419 + 39 =
  37. 37.390 + 58 =
  38. 38.185 + 29 =
  39. 39.391 + 18 =
  40. 40.85 + 98 =

Answer key

  1. 219
  2. 398
  3. 168
  4. 337
  5. 214
  6. 561
  7. 522
  8. 148
  9. 508
  10. 184
  11. 346
  12. 398
  13. 291
  14. 238
  15. 535
  16. 440
  17. 156
  18. 424
  19. 233
  20. 125
  21. 552
  22. 354
  23. 465
  24. 124
  25. 249
  26. 339
  27. 239
  28. 111
  29. 458
  30. 192
  31. 316
  32. 406
  33. 227
  34. 323
  35. 391
  36. 458
  37. 448
  38. 214
  39. 409
  40. 183

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