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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 532 · 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. 1.416 + 68 =
  2. 2.415 + 18 =
  3. 3.129 + 28 =
  4. 4.111 + 97 =
  5. 5.63 + 28 =
  6. 6.29 + 58 =
  7. 7.208 + 77 =
  8. 8.482 + 29 =
  9. 9.95 + 68 =
  10. 10.200 + 58 =
  11. 11.88 + 79 =
  12. 12.424 + 37 =
  13. 13.96 + 27 =
  14. 14.245 + 49 =
  15. 15.161 + 69 =
  16. 16.135 + 58 =
  17. 17.436 + 78 =
  18. 18.497 + 29 =
  19. 19.306 + 39 =
  20. 20.245 + 58 =
  21. 21.406 + 58 =
  22. 22.468 + 17 =
  23. 23.383 + 77 =
  24. 24.393 + 89 =
  25. 25.393 + 88 =
  26. 26.217 + 27 =
  27. 27.55 + 19 =
  28. 28.180 + 57 =
  29. 29.107 + 79 =
  30. 30.117 + 99 =
  31. 31.87 + 47 =
  32. 32.156 + 29 =
  33. 33.265 + 68 =
  34. 34.89 + 57 =
  35. 35.111 + 77 =
  36. 36.477 + 69 =
  37. 37.114 + 37 =
  38. 38.414 + 57 =
  39. 39.270 + 67 =
  40. 40.416 + 38 =

Answer key

  1. 484
  2. 433
  3. 157
  4. 208
  5. 91
  6. 87
  7. 285
  8. 511
  9. 163
  10. 258
  11. 167
  12. 461
  13. 123
  14. 294
  15. 230
  16. 193
  17. 514
  18. 526
  19. 345
  20. 303
  21. 464
  22. 485
  23. 460
  24. 482
  25. 481
  26. 244
  27. 74
  28. 237
  29. 186
  30. 216
  31. 134
  32. 185
  33. 333
  34. 146
  35. 188
  36. 546
  37. 151
  38. 471
  39. 337
  40. 454

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