What is 6/5 of 90?

Often, in mathematics or everyday life, we need to find a fraction of a given number. For instance, how would you quickly calculate 6/5 of 90? We'll show you a straightforward method to achieve that.

How to calculate 6/5 of 90?

  1. Multiply the whole number by the numerator of the fraction: 90 × 6 = 540
  2. Divide this result by denominator of the fraction: 540/5 = 108
  3. Simplify by dividing both the numerator and denominator by their GCD (5):
    • 540/5 = 108
    • 5/5 = 1
  4. Which gives: 108/1

How does it work?

The principle behind finding a fraction of a number, such as 6/5 of 90, is rooted in the method of cross-multiplication.

Consider the following proportion: 6 5 = x 90 (where x represents 6/5 of 90)

  1. Using the cross-multiplication method, multiply both numerators by their opposite denominators: 6 × 90 = 5 x
  2. Which gives: 540 = 5 x
  3. Divide both sides by 5 to isolate x: 540 5 = 5 x 5
  4. Which gives the result: 540 5 = x (or 108 1 = x )

Thus, 6/5 of 90 is equal to 108/1 (or 108 in its decimal form).