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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 749 · 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. 1.263 + 78 =
  2. 2.197 + 99 =
  3. 3.406 + 39 =
  4. 4.429 + 18 =
  5. 5.460 + 28 =
  6. 6.63 + 17 =
  7. 7.156 + 19 =
  8. 8.69 + 39 =
  9. 9.179 + 59 =
  10. 10.315 + 48 =
  11. 11.492 + 17 =
  12. 12.363 + 98 =
  13. 13.336 + 17 =
  14. 14.463 + 27 =
  15. 15.224 + 87 =
  16. 16.310 + 17 =
  17. 17.369 + 17 =
  18. 18.316 + 27 =
  19. 19.161 + 17 =
  20. 20.50 + 27 =
  21. 21.27 + 59 =
  22. 22.433 + 58 =
  23. 23.231 + 57 =
  24. 24.70 + 37 =
  25. 25.117 + 99 =
  26. 26.420 + 19 =
  27. 27.481 + 57 =
  28. 28.216 + 89 =
  29. 29.78 + 87 =
  30. 30.119 + 37 =
  31. 31.477 + 37 =
  32. 32.219 + 97 =
  33. 33.193 + 28 =
  34. 34.412 + 37 =
  35. 35.213 + 67 =
  36. 36.304 + 78 =
  37. 37.73 + 79 =
  38. 38.443 + 79 =
  39. 39.375 + 77 =
  40. 40.313 + 99 =

Answer key

  1. 341
  2. 296
  3. 445
  4. 447
  5. 488
  6. 80
  7. 175
  8. 108
  9. 238
  10. 363
  11. 509
  12. 461
  13. 353
  14. 490
  15. 311
  16. 327
  17. 386
  18. 343
  19. 178
  20. 77
  21. 86
  22. 491
  23. 288
  24. 107
  25. 216
  26. 439
  27. 538
  28. 305
  29. 165
  30. 156
  31. 514
  32. 316
  33. 221
  34. 449
  35. 280
  36. 382
  37. 152
  38. 522
  39. 452
  40. 412

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