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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 645 · 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. 1.101 + 68 =
  2. 2.260 + 38 =
  3. 3.99 + 67 =
  4. 4.211 + 38 =
  5. 5.222 + 79 =
  6. 6.449 + 18 =
  7. 7.249 + 18 =
  8. 8.248 + 68 =
  9. 9.171 + 78 =
  10. 10.124 + 98 =
  11. 11.163 + 28 =
  12. 12.270 + 67 =
  13. 13.178 + 39 =
  14. 14.251 + 67 =
  15. 15.210 + 28 =
  16. 16.430 + 97 =
  17. 17.156 + 99 =
  18. 18.369 + 79 =
  19. 19.240 + 58 =
  20. 20.324 + 67 =
  21. 21.68 + 77 =
  22. 22.424 + 97 =
  23. 23.283 + 67 =
  24. 24.33 + 38 =
  25. 25.407 + 67 =
  26. 26.51 + 68 =
  27. 27.222 + 38 =
  28. 28.46 + 37 =
  29. 29.396 + 87 =
  30. 30.477 + 47 =
  31. 31.284 + 97 =
  32. 32.490 + 69 =
  33. 33.244 + 88 =
  34. 34.84 + 87 =
  35. 35.463 + 99 =
  36. 36.52 + 17 =
  37. 37.315 + 87 =
  38. 38.406 + 48 =
  39. 39.357 + 37 =
  40. 40.152 + 27 =

Answer key

  1. 169
  2. 298
  3. 166
  4. 249
  5. 301
  6. 467
  7. 267
  8. 316
  9. 249
  10. 222
  11. 191
  12. 337
  13. 217
  14. 318
  15. 238
  16. 527
  17. 255
  18. 448
  19. 298
  20. 391
  21. 145
  22. 521
  23. 350
  24. 71
  25. 474
  26. 119
  27. 260
  28. 83
  29. 483
  30. 524
  31. 381
  32. 559
  33. 332
  34. 171
  35. 562
  36. 69
  37. 402
  38. 454
  39. 394
  40. 179

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