What is 5/6 of 15?

How to calculate 5/6 of 15?

1. Multiply the whole number by the numerator of the fraction: 15 × 5 = 75
2. Divide this result by denominator of the fraction: 75/6 = 12.5
3. Simplify by dividing both the numerator and denominator by their GCD (3):
   • 75/3 = 25
   • 6/3 = 2
4. Which gives: 25/2

Since 25/2 is an improper fraction, the result could also be expressed as a mixed number: 12 1/2

How does it work?

The principle behind finding a fraction of a number, such as 5/6 of 15, is rooted in the method of cross-multiplication.

Consider the following proportion: $\frac{5}{6}=\frac{x}{15}$ (where x represents 5/6 of 15)

1. Using the cross-multiplication method, multiply both numerators by their opposite denominators: $5\times 15=6x$
2. Which gives: $75=6x$
3. Divide both sides by 6 to isolate x: $\frac{75}{6}=\frac{6x}{6}$
4. Which gives the result: $\frac{75}{6}=x$ (or $\frac{25}{2}=x$)

Thus, 5/6 of 15 is equal to 25/2 (or 12.5 in its decimal form).