Best Answer

1. Factorise 72 and 90.

2 Find the greatest common factor.

3. Divide both, 72 and 90 by their gcf.

So,

72 = 2*2*2*3*3 90 = 2*3*3*5 and their gcf = 2*3*3

Then 72/gcf = 2*2 = 4 and 90/gcf = 5

So 72/90 = 4/5

Q: How do you simplify the ratio 72 to 90?

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72 = 72/1. You can multiply the numerator and denominator of this ratio by any non-zero number to get an equivalent ratio.

No.

90 - 72 = 18

(72/90) * 100

don't think you can simplify it