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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 12 · 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. 1.355 + 67 =
  2. 2.356 + 88 =
  3. 3.339 + 67 =
  4. 4.201 + 69 =
  5. 5.444 + 39 =
  6. 6.377 + 28 =
  7. 7.274 + 39 =
  8. 8.113 + 48 =
  9. 9.374 + 69 =
  10. 10.365 + 17 =
  11. 11.61 + 67 =
  12. 12.111 + 58 =
  13. 13.134 + 67 =
  14. 14.334 + 28 =
  15. 15.80 + 47 =
  16. 16.218 + 28 =
  17. 17.36 + 58 =
  18. 18.198 + 48 =
  19. 19.390 + 69 =
  20. 20.73 + 98 =
  21. 21.159 + 59 =
  22. 22.176 + 58 =
  23. 23.369 + 17 =
  24. 24.450 + 37 =
  25. 25.179 + 59 =
  26. 26.81 + 87 =
  27. 27.347 + 29 =
  28. 28.64 + 57 =
  29. 29.458 + 29 =
  30. 30.324 + 79 =
  31. 31.139 + 69 =
  32. 32.109 + 57 =
  33. 33.241 + 18 =
  34. 34.255 + 98 =
  35. 35.197 + 67 =
  36. 36.256 + 58 =
  37. 37.304 + 29 =
  38. 38.252 + 69 =
  39. 39.153 + 18 =
  40. 40.377 + 29 =

Answer key

  1. 422
  2. 444
  3. 406
  4. 270
  5. 483
  6. 405
  7. 313
  8. 161
  9. 443
  10. 382
  11. 128
  12. 169
  13. 201
  14. 362
  15. 127
  16. 246
  17. 94
  18. 246
  19. 459
  20. 171
  21. 218
  22. 234
  23. 386
  24. 487
  25. 238
  26. 168
  27. 376
  28. 121
  29. 487
  30. 403
  31. 208
  32. 166
  33. 259
  34. 353
  35. 264
  36. 314
  37. 333
  38. 321
  39. 171
  40. 406

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