Yes, 512 is less than 521 by 9.
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521
500
521698/1000 = 521.698 so there are 521 thousands
521 times 21 = 10941
If the values (5.12 m and 512 cm) are exact, then they are equal. However, in Physics, both measurements range over the range 5.12 m +/- 5 mm. One of them could be 5.117 m and the other could be 512.3 cm, a differnce of 0.6 cm. Hope this helps. <Feb 18, 2014 - Bruno>