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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 475 · 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. 1.204 + 67 =
  2. 2.118 + 59 =
  3. 3.240 + 18 =
  4. 4.150 + 18 =
  5. 5.363 + 19 =
  6. 6.316 + 98 =
  7. 7.481 + 27 =
  8. 8.33 + 67 =
  9. 9.337 + 19 =
  10. 10.222 + 39 =
  11. 11.472 + 19 =
  12. 12.332 + 27 =
  13. 13.344 + 58 =
  14. 14.48 + 68 =
  15. 15.174 + 27 =
  16. 16.359 + 27 =
  17. 17.97 + 38 =
  18. 18.175 + 38 =
  19. 19.179 + 69 =
  20. 20.77 + 99 =
  21. 21.471 + 58 =
  22. 22.235 + 17 =
  23. 23.472 + 77 =
  24. 24.332 + 58 =
  25. 25.306 + 89 =
  26. 26.299 + 59 =
  27. 27.142 + 47 =
  28. 28.494 + 37 =
  29. 29.73 + 17 =
  30. 30.97 + 97 =
  31. 31.129 + 27 =
  32. 32.245 + 47 =
  33. 33.403 + 97 =
  34. 34.358 + 68 =
  35. 35.55 + 39 =
  36. 36.329 + 57 =
  37. 37.262 + 57 =
  38. 38.426 + 67 =
  39. 39.127 + 48 =
  40. 40.171 + 28 =

Answer key

  1. 271
  2. 177
  3. 258
  4. 168
  5. 382
  6. 414
  7. 508
  8. 100
  9. 356
  10. 261
  11. 491
  12. 359
  13. 402
  14. 116
  15. 201
  16. 386
  17. 135
  18. 213
  19. 248
  20. 176
  21. 529
  22. 252
  23. 549
  24. 390
  25. 395
  26. 358
  27. 189
  28. 531
  29. 90
  30. 194
  31. 156
  32. 292
  33. 500
  34. 426
  35. 94
  36. 386
  37. 319
  38. 493
  39. 175
  40. 199

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