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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 67 · 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. 1.468 + 48 =
  2. 2.374 + 38 =
  3. 3.252 + 68 =
  4. 4.226 + 48 =
  5. 5.480 + 28 =
  6. 6.250 + 29 =
  7. 7.495 + 79 =
  8. 8.38 + 28 =
  9. 9.57 + 77 =
  10. 10.227 + 98 =
  11. 11.65 + 68 =
  12. 12.75 + 87 =
  13. 13.365 + 99 =
  14. 14.388 + 68 =
  15. 15.119 + 18 =
  16. 16.347 + 18 =
  17. 17.192 + 17 =
  18. 18.120 + 67 =
  19. 19.92 + 29 =
  20. 20.353 + 68 =
  21. 21.340 + 69 =
  22. 22.155 + 58 =
  23. 23.325 + 77 =
  24. 24.149 + 49 =
  25. 25.206 + 67 =
  26. 26.430 + 89 =
  27. 27.284 + 48 =
  28. 28.167 + 77 =
  29. 29.40 + 19 =
  30. 30.162 + 68 =
  31. 31.170 + 79 =
  32. 32.352 + 69 =
  33. 33.66 + 27 =
  34. 34.168 + 27 =
  35. 35.451 + 87 =
  36. 36.336 + 18 =
  37. 37.492 + 77 =
  38. 38.421 + 38 =
  39. 39.215 + 27 =
  40. 40.301 + 77 =

Answer key

  1. 516
  2. 412
  3. 320
  4. 274
  5. 508
  6. 279
  7. 574
  8. 66
  9. 134
  10. 325
  11. 133
  12. 162
  13. 464
  14. 456
  15. 137
  16. 365
  17. 209
  18. 187
  19. 121
  20. 421
  21. 409
  22. 213
  23. 402
  24. 198
  25. 273
  26. 519
  27. 332
  28. 244
  29. 59
  30. 230
  31. 249
  32. 421
  33. 93
  34. 195
  35. 538
  36. 354
  37. 569
  38. 459
  39. 242
  40. 378

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