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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 178 · 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. 1.321 + 37 =
  2. 2.472 + 17 =
  3. 3.87 + 57 =
  4. 4.253 + 29 =
  5. 5.459 + 77 =
  6. 6.243 + 58 =
  7. 7.53 + 99 =
  8. 8.112 + 89 =
  9. 9.316 + 27 =
  10. 10.61 + 68 =
  11. 11.265 + 67 =
  12. 12.124 + 67 =
  13. 13.442 + 19 =
  14. 14.176 + 58 =
  15. 15.107 + 39 =
  16. 16.187 + 59 =
  17. 17.450 + 48 =
  18. 18.120 + 87 =
  19. 19.292 + 98 =
  20. 20.202 + 88 =
  21. 21.25 + 48 =
  22. 22.153 + 48 =
  23. 23.170 + 28 =
  24. 24.122 + 17 =
  25. 25.446 + 77 =
  26. 26.490 + 59 =
  27. 27.299 + 49 =
  28. 28.357 + 88 =
  29. 29.412 + 19 =
  30. 30.329 + 67 =
  31. 31.136 + 29 =
  32. 32.383 + 58 =
  33. 33.408 + 29 =
  34. 34.422 + 27 =
  35. 35.47 + 57 =
  36. 36.267 + 98 =
  37. 37.284 + 49 =
  38. 38.221 + 28 =
  39. 39.325 + 37 =
  40. 40.142 + 68 =

Answer key

  1. 358
  2. 489
  3. 144
  4. 282
  5. 536
  6. 301
  7. 152
  8. 201
  9. 343
  10. 129
  11. 332
  12. 191
  13. 461
  14. 234
  15. 146
  16. 246
  17. 498
  18. 207
  19. 390
  20. 290
  21. 73
  22. 201
  23. 198
  24. 139
  25. 523
  26. 549
  27. 348
  28. 445
  29. 431
  30. 396
  31. 165
  32. 441
  33. 437
  34. 449
  35. 104
  36. 365
  37. 333
  38. 249
  39. 362
  40. 210

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