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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 704 · 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. 1.340 + 87 =
  2. 2.408 + 27 =
  3. 3.177 + 69 =
  4. 4.452 + 79 =
  5. 5.466 + 67 =
  6. 6.404 + 37 =
  7. 7.103 + 47 =
  8. 8.468 + 59 =
  9. 9.199 + 48 =
  10. 10.107 + 49 =
  11. 11.114 + 89 =
  12. 12.459 + 37 =
  13. 13.464 + 77 =
  14. 14.216 + 37 =
  15. 15.286 + 99 =
  16. 16.214 + 77 =
  17. 17.25 + 39 =
  18. 18.244 + 87 =
  19. 19.75 + 49 =
  20. 20.390 + 58 =
  21. 21.391 + 49 =
  22. 22.475 + 68 =
  23. 23.286 + 88 =
  24. 24.56 + 98 =
  25. 25.379 + 39 =
  26. 26.223 + 57 =
  27. 27.226 + 38 =
  28. 28.349 + 69 =
  29. 29.84 + 68 =
  30. 30.40 + 69 =
  31. 31.260 + 47 =
  32. 32.253 + 68 =
  33. 33.225 + 49 =
  34. 34.346 + 47 =
  35. 35.328 + 78 =
  36. 36.433 + 58 =
  37. 37.472 + 18 =
  38. 38.456 + 89 =
  39. 39.38 + 99 =
  40. 40.257 + 89 =

Answer key

  1. 427
  2. 435
  3. 246
  4. 531
  5. 533
  6. 441
  7. 150
  8. 527
  9. 247
  10. 156
  11. 203
  12. 496
  13. 541
  14. 253
  15. 385
  16. 291
  17. 64
  18. 331
  19. 124
  20. 448
  21. 440
  22. 543
  23. 374
  24. 154
  25. 418
  26. 280
  27. 264
  28. 418
  29. 152
  30. 109
  31. 307
  32. 321
  33. 274
  34. 393
  35. 406
  36. 491
  37. 490
  38. 545
  39. 137
  40. 346

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