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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 391 · 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. 1.435 + 78 =
  2. 2.135 + 18 =
  3. 3.154 + 28 =
  4. 4.254 + 78 =
  5. 5.245 + 89 =
  6. 6.51 + 28 =
  7. 7.285 + 37 =
  8. 8.290 + 19 =
  9. 9.93 + 37 =
  10. 10.258 + 89 =
  11. 11.482 + 17 =
  12. 12.111 + 28 =
  13. 13.152 + 29 =
  14. 14.135 + 18 =
  15. 15.414 + 48 =
  16. 16.375 + 18 =
  17. 17.309 + 87 =
  18. 18.99 + 19 =
  19. 19.331 + 78 =
  20. 20.161 + 17 =
  21. 21.60 + 18 =
  22. 22.344 + 79 =
  23. 23.469 + 17 =
  24. 24.264 + 79 =
  25. 25.129 + 38 =
  26. 26.152 + 79 =
  27. 27.215 + 67 =
  28. 28.108 + 89 =
  29. 29.404 + 48 =
  30. 30.269 + 57 =
  31. 31.117 + 19 =
  32. 32.427 + 49 =
  33. 33.254 + 28 =
  34. 34.285 + 98 =
  35. 35.451 + 67 =
  36. 36.154 + 68 =
  37. 37.317 + 29 =
  38. 38.294 + 37 =
  39. 39.135 + 57 =
  40. 40.259 + 47 =

Answer key

  1. 513
  2. 153
  3. 182
  4. 332
  5. 334
  6. 79
  7. 322
  8. 309
  9. 130
  10. 347
  11. 499
  12. 139
  13. 181
  14. 153
  15. 462
  16. 393
  17. 396
  18. 118
  19. 409
  20. 178
  21. 78
  22. 423
  23. 486
  24. 343
  25. 167
  26. 231
  27. 282
  28. 197
  29. 452
  30. 326
  31. 136
  32. 476
  33. 282
  34. 383
  35. 518
  36. 222
  37. 346
  38. 331
  39. 192
  40. 306

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