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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 255 · 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. 1.211 + 47 =
  2. 2.191 + 39 =
  3. 3.150 + 47 =
  4. 4.352 + 87 =
  5. 5.344 + 77 =
  6. 6.379 + 28 =
  7. 7.139 + 69 =
  8. 8.402 + 88 =
  9. 9.182 + 99 =
  10. 10.88 + 18 =
  11. 11.287 + 38 =
  12. 12.89 + 29 =
  13. 13.489 + 28 =
  14. 14.412 + 48 =
  15. 15.224 + 58 =
  16. 16.320 + 67 =
  17. 17.245 + 78 =
  18. 18.48 + 88 =
  19. 19.409 + 57 =
  20. 20.148 + 78 =
  21. 21.232 + 77 =
  22. 22.63 + 98 =
  23. 23.409 + 68 =
  24. 24.183 + 78 =
  25. 25.488 + 67 =
  26. 26.121 + 57 =
  27. 27.489 + 18 =
  28. 28.355 + 59 =
  29. 29.419 + 48 =
  30. 30.329 + 89 =
  31. 31.423 + 68 =
  32. 32.57 + 67 =
  33. 33.493 + 68 =
  34. 34.379 + 97 =
  35. 35.348 + 58 =
  36. 36.470 + 79 =
  37. 37.339 + 47 =
  38. 38.39 + 98 =
  39. 39.388 + 78 =
  40. 40.263 + 48 =

Answer key

  1. 258
  2. 230
  3. 197
  4. 439
  5. 421
  6. 407
  7. 208
  8. 490
  9. 281
  10. 106
  11. 325
  12. 118
  13. 517
  14. 460
  15. 282
  16. 387
  17. 323
  18. 136
  19. 466
  20. 226
  21. 309
  22. 161
  23. 477
  24. 261
  25. 555
  26. 178
  27. 507
  28. 414
  29. 467
  30. 418
  31. 491
  32. 124
  33. 561
  34. 476
  35. 406
  36. 549
  37. 386
  38. 137
  39. 466
  40. 311

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