What is 9/5 of 5?

Often, in mathematics or everyday life, we need to find a fraction of a given number. For instance, how would you quickly calculate 9/5 of 5? We'll show you a straightforward method to achieve that.

How to calculate 9/5 of 5?

  1. Multiply the whole number by the numerator of the fraction: 5 × 9 = 45
  2. Divide this result by denominator of the fraction: 45/5 = 9
  3. Simplify by dividing both the numerator and denominator by their GCD (5):
    • 45/5 = 9
    • 5/5 = 1
  4. Which gives: 9/1

How does it work?

The principle behind finding a fraction of a number, such as 9/5 of 5, is rooted in the method of cross-multiplication.

Consider the following proportion: 9 5 = x 5 (where x represents 9/5 of 5)

  1. Using the cross-multiplication method, multiply both numerators by their opposite denominators: 9 × 5 = 5 x
  2. Which gives: 45 = 5 x
  3. Divide both sides by 5 to isolate x: 45 5 = 5 x 5
  4. Which gives the result: 45 5 = x (or 9 1 = x )

Thus, 9/5 of 5 is equal to 9/1 (or 9 in its decimal form).