What is 5/7 of 7?

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 7? We'll show you a straightforward method to achieve that.

How to calculate 5/7 of 7?

  1. Multiply the whole number by the numerator of the fraction: 7 × 5 = 35
  2. Divide this result by denominator of the fraction: 35/7 = 5
  3. Simplify by dividing both the numerator and denominator by their GCD (7):
    • 35/7 = 5
    • 7/7 = 1
  4. Which gives: 5/1

How does it work?

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

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

  1. Using the cross-multiplication method, multiply both numerators by their opposite denominators: 5 × 7 = 7 x
  2. Which gives: 35 = 7 x
  3. Divide both sides by 7 to isolate x: 35 7 = 7 x 7
  4. Which gives the result: 35 7 = x (or 5 1 = x )

Thus, 5/7 of 7 is equal to 5/1 (or 5 in its decimal form).