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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 217 · 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 + 89 =
  2. 2.156 + 78 =
  3. 3.477 + 17 =
  4. 4.234 + 17 =
  5. 5.30 + 19 =
  6. 6.48 + 99 =
  7. 7.97 + 77 =
  8. 8.302 + 59 =
  9. 9.456 + 88 =
  10. 10.216 + 29 =
  11. 11.49 + 88 =
  12. 12.80 + 67 =
  13. 13.415 + 58 =
  14. 14.359 + 88 =
  15. 15.410 + 18 =
  16. 16.453 + 67 =
  17. 17.486 + 67 =
  18. 18.171 + 97 =
  19. 19.149 + 77 =
  20. 20.200 + 77 =
  21. 21.176 + 27 =
  22. 22.393 + 17 =
  23. 23.176 + 58 =
  24. 24.269 + 17 =
  25. 25.180 + 89 =
  26. 26.118 + 29 =
  27. 27.172 + 88 =
  28. 28.373 + 38 =
  29. 29.335 + 39 =
  30. 30.367 + 28 =
  31. 31.278 + 87 =
  32. 32.129 + 79 =
  33. 33.57 + 39 =
  34. 34.450 + 29 =
  35. 35.103 + 69 =
  36. 36.406 + 77 =
  37. 37.189 + 17 =
  38. 38.452 + 57 =
  39. 39.214 + 89 =
  40. 40.472 + 17 =

Answer key

  1. 410
  2. 234
  3. 494
  4. 251
  5. 49
  6. 147
  7. 174
  8. 361
  9. 544
  10. 245
  11. 137
  12. 147
  13. 473
  14. 447
  15. 428
  16. 520
  17. 553
  18. 268
  19. 226
  20. 277
  21. 203
  22. 410
  23. 234
  24. 286
  25. 269
  26. 147
  27. 260
  28. 411
  29. 374
  30. 395
  31. 365
  32. 208
  33. 96
  34. 479
  35. 172
  36. 483
  37. 206
  38. 509
  39. 303
  40. 489

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