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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 788 · 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. 1.171 + 79 =
  2. 2.485 + 29 =
  3. 3.158 + 27 =
  4. 4.106 + 79 =
  5. 5.386 + 38 =
  6. 6.291 + 79 =
  7. 7.217 + 27 =
  8. 8.429 + 38 =
  9. 9.68 + 69 =
  10. 10.365 + 17 =
  11. 11.50 + 29 =
  12. 12.114 + 17 =
  13. 13.270 + 69 =
  14. 14.59 + 38 =
  15. 15.37 + 17 =
  16. 16.91 + 48 =
  17. 17.489 + 17 =
  18. 18.390 + 19 =
  19. 19.100 + 87 =
  20. 20.55 + 27 =
  21. 21.336 + 29 =
  22. 22.366 + 27 =
  23. 23.83 + 39 =
  24. 24.30 + 19 =
  25. 25.259 + 29 =
  26. 26.252 + 37 =
  27. 27.453 + 27 =
  28. 28.164 + 78 =
  29. 29.282 + 87 =
  30. 30.289 + 39 =
  31. 31.224 + 18 =
  32. 32.219 + 67 =
  33. 33.452 + 97 =
  34. 34.189 + 59 =
  35. 35.194 + 87 =
  36. 36.160 + 67 =
  37. 37.170 + 67 =
  38. 38.171 + 69 =
  39. 39.60 + 67 =
  40. 40.61 + 77 =

Answer key

  1. 250
  2. 514
  3. 185
  4. 185
  5. 424
  6. 370
  7. 244
  8. 467
  9. 137
  10. 382
  11. 79
  12. 131
  13. 339
  14. 97
  15. 54
  16. 139
  17. 506
  18. 409
  19. 187
  20. 82
  21. 365
  22. 393
  23. 122
  24. 49
  25. 288
  26. 289
  27. 480
  28. 242
  29. 369
  30. 328
  31. 242
  32. 286
  33. 549
  34. 248
  35. 281
  36. 227
  37. 237
  38. 240
  39. 127
  40. 138

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