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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 215 · 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. 1.450 + 57 =
  2. 2.211 + 18 =
  3. 3.157 + 67 =
  4. 4.192 + 67 =
  5. 5.447 + 47 =
  6. 6.417 + 68 =
  7. 7.416 + 89 =
  8. 8.143 + 59 =
  9. 9.44 + 89 =
  10. 10.84 + 28 =
  11. 11.483 + 47 =
  12. 12.246 + 99 =
  13. 13.230 + 69 =
  14. 14.491 + 47 =
  15. 15.470 + 28 =
  16. 16.293 + 17 =
  17. 17.490 + 79 =
  18. 18.346 + 29 =
  19. 19.49 + 39 =
  20. 20.488 + 18 =
  21. 21.472 + 18 =
  22. 22.440 + 69 =
  23. 23.390 + 57 =
  24. 24.230 + 18 =
  25. 25.338 + 49 =
  26. 26.207 + 49 =
  27. 27.160 + 67 =
  28. 28.249 + 99 =
  29. 29.308 + 57 =
  30. 30.141 + 87 =
  31. 31.401 + 57 =
  32. 32.374 + 67 =
  33. 33.225 + 58 =
  34. 34.30 + 29 =
  35. 35.229 + 39 =
  36. 36.498 + 17 =
  37. 37.358 + 29 =
  38. 38.488 + 27 =
  39. 39.427 + 58 =
  40. 40.367 + 27 =

Answer key

  1. 507
  2. 229
  3. 224
  4. 259
  5. 494
  6. 485
  7. 505
  8. 202
  9. 133
  10. 112
  11. 530
  12. 345
  13. 299
  14. 538
  15. 498
  16. 310
  17. 569
  18. 375
  19. 88
  20. 506
  21. 490
  22. 509
  23. 447
  24. 248
  25. 387
  26. 256
  27. 227
  28. 348
  29. 365
  30. 228
  31. 458
  32. 441
  33. 283
  34. 59
  35. 268
  36. 515
  37. 387
  38. 515
  39. 485
  40. 394

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