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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 734 · 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. 1.306 + 77 =
  2. 2.436 + 77 =
  3. 3.229 + 49 =
  4. 4.461 + 17 =
  5. 5.492 + 79 =
  6. 6.113 + 59 =
  7. 7.307 + 18 =
  8. 8.62 + 39 =
  9. 9.312 + 27 =
  10. 10.148 + 77 =
  11. 11.354 + 99 =
  12. 12.472 + 89 =
  13. 13.213 + 39 =
  14. 14.209 + 98 =
  15. 15.456 + 48 =
  16. 16.294 + 38 =
  17. 17.152 + 39 =
  18. 18.443 + 28 =
  19. 19.270 + 28 =
  20. 20.369 + 18 =
  21. 21.363 + 17 =
  22. 22.308 + 19 =
  23. 23.213 + 39 =
  24. 24.219 + 97 =
  25. 25.258 + 67 =
  26. 26.97 + 18 =
  27. 27.44 + 29 =
  28. 28.279 + 19 =
  29. 29.399 + 27 =
  30. 30.148 + 38 =
  31. 31.446 + 99 =
  32. 32.440 + 57 =
  33. 33.103 + 88 =
  34. 34.220 + 47 =
  35. 35.428 + 58 =
  36. 36.365 + 48 =
  37. 37.408 + 38 =
  38. 38.93 + 88 =
  39. 39.487 + 78 =
  40. 40.31 + 78 =

Answer key

  1. 383
  2. 513
  3. 278
  4. 478
  5. 571
  6. 172
  7. 325
  8. 101
  9. 339
  10. 225
  11. 453
  12. 561
  13. 252
  14. 307
  15. 504
  16. 332
  17. 191
  18. 471
  19. 298
  20. 387
  21. 380
  22. 327
  23. 252
  24. 316
  25. 325
  26. 115
  27. 73
  28. 298
  29. 426
  30. 186
  31. 545
  32. 497
  33. 191
  34. 267
  35. 486
  36. 413
  37. 446
  38. 181
  39. 565
  40. 109

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