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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 585 · 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. 1.299 + 37 =
  2. 2.126 + 79 =
  3. 3.406 + 78 =
  4. 4.337 + 79 =
  5. 5.222 + 57 =
  6. 6.336 + 99 =
  7. 7.295 + 38 =
  8. 8.234 + 19 =
  9. 9.329 + 89 =
  10. 10.423 + 97 =
  11. 11.77 + 48 =
  12. 12.289 + 17 =
  13. 13.154 + 17 =
  14. 14.193 + 19 =
  15. 15.206 + 68 =
  16. 16.361 + 99 =
  17. 17.121 + 47 =
  18. 18.110 + 87 =
  19. 19.202 + 99 =
  20. 20.262 + 68 =
  21. 21.392 + 58 =
  22. 22.118 + 78 =
  23. 23.275 + 29 =
  24. 24.414 + 38 =
  25. 25.221 + 37 =
  26. 26.479 + 38 =
  27. 27.360 + 57 =
  28. 28.485 + 59 =
  29. 29.425 + 49 =
  30. 30.248 + 58 =
  31. 31.236 + 49 =
  32. 32.113 + 29 =
  33. 33.308 + 29 =
  34. 34.203 + 17 =
  35. 35.119 + 19 =
  36. 36.215 + 28 =
  37. 37.79 + 19 =
  38. 38.359 + 97 =
  39. 39.214 + 39 =
  40. 40.428 + 27 =

Answer key

  1. 336
  2. 205
  3. 484
  4. 416
  5. 279
  6. 435
  7. 333
  8. 253
  9. 418
  10. 520
  11. 125
  12. 306
  13. 171
  14. 212
  15. 274
  16. 460
  17. 168
  18. 197
  19. 301
  20. 330
  21. 450
  22. 196
  23. 304
  24. 452
  25. 258
  26. 517
  27. 417
  28. 544
  29. 474
  30. 306
  31. 285
  32. 142
  33. 337
  34. 220
  35. 138
  36. 243
  37. 98
  38. 456
  39. 253
  40. 455

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