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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 827 · 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. 1.241 + 28 =
  2. 2.294 + 59 =
  3. 3.496 + 19 =
  4. 4.104 + 48 =
  5. 5.31 + 49 =
  6. 6.119 + 87 =
  7. 7.299 + 59 =
  8. 8.368 + 28 =
  9. 9.138 + 88 =
  10. 10.218 + 37 =
  11. 11.286 + 19 =
  12. 12.471 + 67 =
  13. 13.41 + 99 =
  14. 14.398 + 89 =
  15. 15.458 + 87 =
  16. 16.133 + 79 =
  17. 17.429 + 27 =
  18. 18.127 + 58 =
  19. 19.231 + 77 =
  20. 20.299 + 37 =
  21. 21.125 + 27 =
  22. 22.439 + 68 =
  23. 23.389 + 29 =
  24. 24.345 + 39 =
  25. 25.348 + 17 =
  26. 26.61 + 78 =
  27. 27.292 + 58 =
  28. 28.147 + 88 =
  29. 29.189 + 77 =
  30. 30.159 + 17 =
  31. 31.201 + 19 =
  32. 32.101 + 59 =
  33. 33.209 + 77 =
  34. 34.197 + 27 =
  35. 35.356 + 18 =
  36. 36.399 + 88 =
  37. 37.432 + 37 =
  38. 38.332 + 17 =
  39. 39.137 + 29 =
  40. 40.354 + 99 =

Answer key

  1. 269
  2. 353
  3. 515
  4. 152
  5. 80
  6. 206
  7. 358
  8. 396
  9. 226
  10. 255
  11. 305
  12. 538
  13. 140
  14. 487
  15. 545
  16. 212
  17. 456
  18. 185
  19. 308
  20. 336
  21. 152
  22. 507
  23. 418
  24. 384
  25. 365
  26. 139
  27. 350
  28. 235
  29. 266
  30. 176
  31. 220
  32. 160
  33. 286
  34. 224
  35. 374
  36. 487
  37. 469
  38. 349
  39. 166
  40. 453

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