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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 548 · 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. 1.363 + 87 =
  2. 2.69 + 39 =
  3. 3.241 + 38 =
  4. 4.467 + 38 =
  5. 5.146 + 87 =
  6. 6.51 + 69 =
  7. 7.291 + 87 =
  8. 8.245 + 19 =
  9. 9.73 + 47 =
  10. 10.80 + 89 =
  11. 11.403 + 98 =
  12. 12.131 + 37 =
  13. 13.27 + 17 =
  14. 14.338 + 88 =
  15. 15.352 + 69 =
  16. 16.174 + 49 =
  17. 17.325 + 27 =
  18. 18.222 + 87 =
  19. 19.448 + 27 =
  20. 20.113 + 57 =
  21. 21.403 + 17 =
  22. 22.467 + 59 =
  23. 23.446 + 57 =
  24. 24.105 + 47 =
  25. 25.25 + 18 =
  26. 26.69 + 38 =
  27. 27.197 + 38 =
  28. 28.40 + 57 =
  29. 29.379 + 79 =
  30. 30.235 + 59 =
  31. 31.390 + 18 =
  32. 32.178 + 49 =
  33. 33.48 + 38 =
  34. 34.206 + 27 =
  35. 35.254 + 97 =
  36. 36.83 + 77 =
  37. 37.229 + 69 =
  38. 38.321 + 59 =
  39. 39.166 + 38 =
  40. 40.215 + 27 =

Answer key

  1. 450
  2. 108
  3. 279
  4. 505
  5. 233
  6. 120
  7. 378
  8. 264
  9. 120
  10. 169
  11. 501
  12. 168
  13. 44
  14. 426
  15. 421
  16. 223
  17. 352
  18. 309
  19. 475
  20. 170
  21. 420
  22. 526
  23. 503
  24. 152
  25. 43
  26. 107
  27. 235
  28. 97
  29. 458
  30. 294
  31. 408
  32. 227
  33. 86
  34. 233
  35. 351
  36. 160
  37. 298
  38. 380
  39. 204
  40. 242

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