What is 5/7 of 11?

Often, in mathematics or everyday life, we need to find a fraction of a given number. For instance, how would you quickly calculate 5/7 of 11? We'll show you a straightforward method to achieve that.

How to calculate 5/7 of 11?

  1. Multiply the whole number by the numerator of the fraction: 11 × 5 = 55
  2. Divide this result by denominator of the fraction: 55/7 = 7.8571428571429

Since 55/7 is an improper fraction, the result could also be expressed as a mixed number: 7 6/7

How does it work?

The principle behind finding a fraction of a number, such as 5/7 of 11, is rooted in the method of cross-multiplication.

Consider the following proportion: 5 7 = x 11 (where x represents 5/7 of 11)

  1. Using the cross-multiplication method, multiply both numerators by their opposite denominators: 5 × 11 = 7 x
  2. Which gives: 55 = 7 x
  3. Divide both sides by 7 to isolate x: 55 7 = 7 x 7
  4. Which gives the result: 55 7 = x

Thus, 5/7 of 11 is equal to 55/7 (or 7.8571428571429 in its decimal form).