What is 5/9 of 79?

Often, in mathematics or everyday life, we need to find a fraction of a given number. For instance, how would you quickly calculate 5/9 of 79? We'll show you a straightforward method to achieve that.

How to calculate 5/9 of 79?

  1. Multiply the whole number by the numerator of the fraction: 79 × 5 = 395
  2. Divide this result by denominator of the fraction: 395/9 = 43.888888888889

Since 395/9 is an improper fraction, the result could also be expressed as a mixed number: 43 8/9

How does it work?

The principle behind finding a fraction of a number, such as 5/9 of 79, is rooted in the method of cross-multiplication.

Consider the following proportion: 5 9 = x 79 (where x represents 5/9 of 79)

  1. Using the cross-multiplication method, multiply both numerators by their opposite denominators: 5 × 79 = 9 x
  2. Which gives: 395 = 9 x
  3. Divide both sides by 9 to isolate x: 395 9 = 9 x 9
  4. Which gives the result: 395 9 = x

Thus, 5/9 of 79 is equal to 395/9 (or 43.888888888889 in its decimal form).