What is 8/1 of 91?

Often, in mathematics or everyday life, we need to find a fraction of a given number. For instance, how would you quickly calculate 8/1 of 91? We'll show you a straightforward method to achieve that.

How to calculate 8/1 of 91?

  1. Multiply the whole number by the numerator of the fraction: 91 × 8 = 728
  2. Divide this result by denominator of the fraction: 728/1 = 728

How does it work?

The principle behind finding a fraction of a number, such as 8/1 of 91, is rooted in the method of cross-multiplication.

Consider the following proportion: 8 1 = x 91 (where x represents 8/1 of 91)

  1. Using the cross-multiplication method, multiply both numerators by their opposite denominators: 8 × 91 = 1 x
  2. Which gives: 728 = 1 x
  3. Divide both sides by 1 to isolate x: 728 1 = 1 x 1
  4. Which gives the result: 728 1 = x

Thus, 8/1 of 91 is equal to 728/1 (or 728 in its decimal form).