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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 735 · 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. 1.372 + 67 =
  2. 2.163 + 57 =
  3. 3.66 + 77 =
  4. 4.55 + 87 =
  5. 5.30 + 69 =
  6. 6.468 + 39 =
  7. 7.66 + 58 =
  8. 8.322 + 99 =
  9. 9.72 + 98 =
  10. 10.221 + 58 =
  11. 11.47 + 38 =
  12. 12.351 + 57 =
  13. 13.61 + 28 =
  14. 14.73 + 29 =
  15. 15.219 + 79 =
  16. 16.333 + 27 =
  17. 17.159 + 49 =
  18. 18.327 + 18 =
  19. 19.28 + 17 =
  20. 20.246 + 38 =
  21. 21.186 + 89 =
  22. 22.157 + 97 =
  23. 23.68 + 17 =
  24. 24.44 + 18 =
  25. 25.487 + 97 =
  26. 26.240 + 77 =
  27. 27.471 + 99 =
  28. 28.229 + 38 =
  29. 29.452 + 97 =
  30. 30.475 + 68 =
  31. 31.486 + 47 =
  32. 32.317 + 77 =
  33. 33.354 + 18 =
  34. 34.201 + 99 =
  35. 35.361 + 29 =
  36. 36.120 + 88 =
  37. 37.470 + 97 =
  38. 38.141 + 57 =
  39. 39.307 + 18 =
  40. 40.257 + 98 =

Answer key

  1. 439
  2. 220
  3. 143
  4. 142
  5. 99
  6. 507
  7. 124
  8. 421
  9. 170
  10. 279
  11. 85
  12. 408
  13. 89
  14. 102
  15. 298
  16. 360
  17. 208
  18. 345
  19. 45
  20. 284
  21. 275
  22. 254
  23. 85
  24. 62
  25. 584
  26. 317
  27. 570
  28. 267
  29. 549
  30. 543
  31. 533
  32. 394
  33. 372
  34. 300
  35. 390
  36. 208
  37. 567
  38. 198
  39. 325
  40. 355

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