To write the ratio as a fraction in the simplest form, the first step is to write both decimal values as fractions:
Next, divide the first value of the ratio by the second value:
To divide two fractions, you have to multiply the first fraction (dividend) by the reciprocal of the second fraction (divisor)
Now you can simplify the fraction, 90 and 54 are multiples of 18. To simplify the fraction you have to divide the numerator and denominator by 18:
The ratio expressed as a fraction in its simplest form is: