What is 7/9 of 27?

Often, in mathematics or everyday life, we need to find a fraction of a given number. For instance, how would you quickly calculate 7/9 of 27? We'll show you a straightforward method to achieve that.

How to calculate 7/9 of 27?

  1. Multiply the whole number by the numerator of the fraction: 27 × 7 = 189
  2. Divide this result by denominator of the fraction: 189/9 = 21
  3. Simplify by dividing both the numerator and denominator by their GCD (9):
    • 189/9 = 21
    • 9/9 = 1
  4. Which gives: 21/1

How does it work?

The principle behind finding a fraction of a number, such as 7/9 of 27, is rooted in the method of cross-multiplication.

Consider the following proportion: 7 9 = x 27 (where x represents 7/9 of 27)

  1. Using the cross-multiplication method, multiply both numerators by their opposite denominators: 7 × 27 = 9 x
  2. Which gives: 189 = 9 x
  3. Divide both sides by 9 to isolate x: 189 9 = 9 x 9
  4. Which gives the result: 189 9 = x (or 21 1 = x )

Thus, 7/9 of 27 is equal to 21/1 (or 21 in its decimal form).