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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 287 · 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. 1.248 + 29 =
  2. 2.499 + 98 =
  3. 3.444 + 39 =
  4. 4.185 + 29 =
  5. 5.169 + 77 =
  6. 6.123 + 78 =
  7. 7.489 + 27 =
  8. 8.128 + 27 =
  9. 9.417 + 29 =
  10. 10.217 + 67 =
  11. 11.214 + 69 =
  12. 12.389 + 67 =
  13. 13.290 + 29 =
  14. 14.151 + 17 =
  15. 15.41 + 19 =
  16. 16.137 + 18 =
  17. 17.230 + 28 =
  18. 18.416 + 87 =
  19. 19.194 + 18 =
  20. 20.68 + 89 =
  21. 21.450 + 79 =
  22. 22.488 + 97 =
  23. 23.443 + 38 =
  24. 24.467 + 88 =
  25. 25.432 + 17 =
  26. 26.497 + 59 =
  27. 27.379 + 27 =
  28. 28.225 + 49 =
  29. 29.447 + 67 =
  30. 30.105 + 59 =
  31. 31.381 + 48 =
  32. 32.270 + 17 =
  33. 33.101 + 59 =
  34. 34.388 + 87 =
  35. 35.66 + 18 =
  36. 36.157 + 78 =
  37. 37.298 + 38 =
  38. 38.432 + 28 =
  39. 39.62 + 69 =
  40. 40.463 + 78 =

Answer key

  1. 277
  2. 597
  3. 483
  4. 214
  5. 246
  6. 201
  7. 516
  8. 155
  9. 446
  10. 284
  11. 283
  12. 456
  13. 319
  14. 168
  15. 60
  16. 155
  17. 258
  18. 503
  19. 212
  20. 157
  21. 529
  22. 585
  23. 481
  24. 555
  25. 449
  26. 556
  27. 406
  28. 274
  29. 514
  30. 164
  31. 429
  32. 287
  33. 160
  34. 475
  35. 84
  36. 235
  37. 336
  38. 460
  39. 131
  40. 541

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