What is 6/5 of 18?
Often, in mathematics or everyday life, we need to find a fraction of a given number. For instance, how would you quickly calculate 6/5 of 18? We'll show you a straightforward method to achieve that.
How to calculate 6/5 of 18?
- Multiply the whole number by the numerator of the fraction: 18 × 6 = 108
- Divide this result by denominator of the fraction: 108/5 = 21.6
Since 108/5 is an improper fraction, the result could also be expressed as a mixed number: 21 3/5
How does it work?
The principle behind finding a fraction of a number, such as 6/5 of 18, is rooted in the method of cross-multiplication.
Consider the following proportion: (where x represents 6/5 of 18)
- Using the cross-multiplication method, multiply both numerators by their opposite denominators:
- Which gives:
- Divide both sides by 5 to isolate x:
- Which gives the result:
Thus, 6/5 of 18 is equal to 108/5 (or 21.6 in its decimal form).