What is 3/2 of 80?

Often, in mathematics or everyday life, we need to find a fraction of a given number. For instance, how would you quickly calculate 3/2 of 80? We'll show you a straightforward method to achieve that.

How to calculate 3/2 of 80?

  1. Multiply the whole number by the numerator of the fraction: 80 × 3 = 240
  2. Divide this result by denominator of the fraction: 240/2 = 120
  3. Simplify by dividing both the numerator and denominator by their GCD (2):
    • 240/2 = 120
    • 2/2 = 1
  4. Which gives: 120/1

How does it work?

The principle behind finding a fraction of a number, such as 3/2 of 80, is rooted in the method of cross-multiplication.

Consider the following proportion: 3 2 = x 80 (where x represents 3/2 of 80)

  1. Using the cross-multiplication method, multiply both numerators by their opposite denominators: 3 × 80 = 2 x
  2. Which gives: 240 = 2 x
  3. Divide both sides by 2 to isolate x: 240 2 = 2 x 2
  4. Which gives the result: 240 2 = x (or 120 1 = x )

Thus, 3/2 of 80 is equal to 120/1 (or 120 in its decimal form).