0.9AU, 0.9C, 0.9 Parsecs, 0.9 miles, all make sense half an AU, half the speed of light, half a parsec, half a mile, again fine 90% of an AU, 90% of the speed

0.9AU, 0.9C, 0.9 Parsecs, 0.9 miles, all make sense half an AU, half the speed of light, half a parsec, half a mile, again fine 90% of an AU, 90% of the speed of light, 90% of a parsec, 90% of a mile. That sounds odd.