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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 289 · 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. 1.287 + 19 =
  2. 2.365 + 77 =
  3. 3.261 + 68 =
  4. 4.464 + 97 =
  5. 5.291 + 18 =
  6. 6.196 + 89 =
  7. 7.49 + 77 =
  8. 8.181 + 98 =
  9. 9.375 + 67 =
  10. 10.191 + 67 =
  11. 11.348 + 78 =
  12. 12.295 + 27 =
  13. 13.139 + 89 =
  14. 14.430 + 87 =
  15. 15.59 + 39 =
  16. 16.107 + 29 =
  17. 17.141 + 59 =
  18. 18.173 + 37 =
  19. 19.162 + 19 =
  20. 20.72 + 59 =
  21. 21.482 + 27 =
  22. 22.116 + 47 =
  23. 23.308 + 97 =
  24. 24.249 + 77 =
  25. 25.472 + 77 =
  26. 26.125 + 17 =
  27. 27.258 + 89 =
  28. 28.225 + 57 =
  29. 29.167 + 48 =
  30. 30.175 + 59 =
  31. 31.389 + 98 =
  32. 32.364 + 88 =
  33. 33.206 + 77 =
  34. 34.465 + 19 =
  35. 35.323 + 87 =
  36. 36.40 + 28 =
  37. 37.75 + 67 =
  38. 38.90 + 98 =
  39. 39.175 + 59 =
  40. 40.66 + 79 =

Answer key

  1. 306
  2. 442
  3. 329
  4. 561
  5. 309
  6. 285
  7. 126
  8. 279
  9. 442
  10. 258
  11. 426
  12. 322
  13. 228
  14. 517
  15. 98
  16. 136
  17. 200
  18. 210
  19. 181
  20. 131
  21. 509
  22. 163
  23. 405
  24. 326
  25. 549
  26. 142
  27. 347
  28. 282
  29. 215
  30. 234
  31. 487
  32. 452
  33. 283
  34. 484
  35. 410
  36. 68
  37. 142
  38. 188
  39. 234
  40. 145

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