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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 158 · 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. 1.206 + 68 =
  2. 2.156 + 67 =
  3. 3.85 + 37 =
  4. 4.273 + 79 =
  5. 5.252 + 28 =
  6. 6.300 + 49 =
  7. 7.255 + 18 =
  8. 8.391 + 97 =
  9. 9.201 + 58 =
  10. 10.259 + 37 =
  11. 11.137 + 79 =
  12. 12.287 + 17 =
  13. 13.489 + 59 =
  14. 14.368 + 58 =
  15. 15.348 + 59 =
  16. 16.139 + 58 =
  17. 17.177 + 77 =
  18. 18.214 + 77 =
  19. 19.55 + 87 =
  20. 20.411 + 88 =
  21. 21.62 + 69 =
  22. 22.243 + 28 =
  23. 23.430 + 39 =
  24. 24.110 + 77 =
  25. 25.470 + 89 =
  26. 26.452 + 67 =
  27. 27.400 + 47 =
  28. 28.90 + 78 =
  29. 29.340 + 17 =
  30. 30.256 + 58 =
  31. 31.102 + 47 =
  32. 32.283 + 37 =
  33. 33.353 + 89 =
  34. 34.385 + 47 =
  35. 35.153 + 29 =
  36. 36.90 + 47 =
  37. 37.378 + 58 =
  38. 38.242 + 88 =
  39. 39.312 + 27 =
  40. 40.79 + 98 =

Answer key

  1. 274
  2. 223
  3. 122
  4. 352
  5. 280
  6. 349
  7. 273
  8. 488
  9. 259
  10. 296
  11. 216
  12. 304
  13. 548
  14. 426
  15. 407
  16. 197
  17. 254
  18. 291
  19. 142
  20. 499
  21. 131
  22. 271
  23. 469
  24. 187
  25. 559
  26. 519
  27. 447
  28. 168
  29. 357
  30. 314
  31. 149
  32. 320
  33. 442
  34. 432
  35. 182
  36. 137
  37. 436
  38. 330
  39. 339
  40. 177

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