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You can in the UK.
There are many ratios that form a proportion 5/7. For instance: 5/7 = 10/14 So any ratio that forms a proportion with 5 over 7 is 5k1/(7k2) where k1 = k2, and k1, k2 are any real values.
0.01
21.59 in standard form is 2.159 × 101
It would look exactly like 1200. You couldn't tell the difference.