45% = 9⁄20
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45% = 9/20
4 over 9
6/45 =2/15 because 3 goes into 6 two times and into 45 15 times.
The square root of 45 in simplest form is 3sqrt(5). You take the 2 roots from 45 (5 and 9) and find out the square root of 9 is 3, while the square root of 5 is still just square root 5.
45 as a fraction 45/100 but in the lowest terms it is 9/20