What is 9/10 of 47?

Often, in mathematics or everyday life, we need to find a fraction of a given number. For instance, how would you quickly calculate 9/10 of 47? We'll show you a straightforward method to achieve that.

How to calculate 9/10 of 47?

  1. Multiply the whole number by the numerator of the fraction: 47 × 9 = 423
  2. Divide this result by denominator of the fraction: 423/10 = 42.3

Since 423/10 is an improper fraction, the result could also be expressed as a mixed number: 42 3/10

How does it work?

The principle behind finding a fraction of a number, such as 9/10 of 47, is rooted in the method of cross-multiplication.

Consider the following proportion: 9 10 = x 47 (where x represents 9/10 of 47)

  1. Using the cross-multiplication method, multiply both numerators by their opposite denominators: 9 × 47 = 10 x
  2. Which gives: 423 = 10 x
  3. Divide both sides by 10 to isolate x: 423 10 = 10 x 10
  4. Which gives the result: 423 10 = x

Thus, 9/10 of 47 is equal to 423/10 (or 42.3 in its decimal form).