Divide one of them by the other one.
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A ratio is a property of two or more numbers. It is not possible to find the ratio of a single number.
It is a ratio.
The ratio of the number of one-digit prime numbers to the number of one-digit composite numbers is one to one. The one-digit prime numbers are 2, 3, 5, and 7. The one-digit composite numbers are 4, 6, 8, and 9. Therefor, the ratio is 4:4, which simplifies to 1:1.
Find their greatest common factor, which is 2. Divide both by 2. That gives a ratio of 213 to 3500000.
The ratio is 8 : 16 or 8/16 or 1/2 or 0.5 .