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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 715 · 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. 1.127 + 58 =
  2. 2.203 + 29 =
  3. 3.122 + 98 =
  4. 4.151 + 97 =
  5. 5.423 + 88 =
  6. 6.377 + 28 =
  7. 7.165 + 78 =
  8. 8.211 + 58 =
  9. 9.429 + 39 =
  10. 10.342 + 37 =
  11. 11.240 + 17 =
  12. 12.168 + 37 =
  13. 13.407 + 68 =
  14. 14.444 + 37 =
  15. 15.116 + 98 =
  16. 16.327 + 57 =
  17. 17.474 + 78 =
  18. 18.123 + 87 =
  19. 19.482 + 88 =
  20. 20.478 + 77 =
  21. 21.102 + 69 =
  22. 22.289 + 89 =
  23. 23.73 + 28 =
  24. 24.86 + 19 =
  25. 25.54 + 17 =
  26. 26.417 + 19 =
  27. 27.309 + 88 =
  28. 28.62 + 19 =
  29. 29.464 + 77 =
  30. 30.489 + 49 =
  31. 31.469 + 19 =
  32. 32.234 + 97 =
  33. 33.123 + 18 =
  34. 34.457 + 79 =
  35. 35.363 + 48 =
  36. 36.128 + 79 =
  37. 37.157 + 69 =
  38. 38.248 + 37 =
  39. 39.83 + 18 =
  40. 40.382 + 78 =

Answer key

  1. 185
  2. 232
  3. 220
  4. 248
  5. 511
  6. 405
  7. 243
  8. 269
  9. 468
  10. 379
  11. 257
  12. 205
  13. 475
  14. 481
  15. 214
  16. 384
  17. 552
  18. 210
  19. 570
  20. 555
  21. 171
  22. 378
  23. 101
  24. 105
  25. 71
  26. 436
  27. 397
  28. 81
  29. 541
  30. 538
  31. 488
  32. 331
  33. 141
  34. 536
  35. 411
  36. 207
  37. 226
  38. 285
  39. 101
  40. 460

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