What is 1/7 of 91?

How to calculate 1/7 of 91?

1. Multiply the whole number by the numerator of the fraction: 91 × 1 = 91
2. Divide this result by denominator of the fraction: 91/7 = 13
3. Simplify by dividing both the numerator and denominator by their GCD (7):
   • 91/7 = 13
   • 7/7 = 1
4. Which gives: 13/1

How does it work?

The principle behind finding a fraction of a number, such as 1/7 of 91, is rooted in the method of cross-multiplication.

Consider the following proportion: $\frac{1}{7}=\frac{x}{91}$ (where x represents 1/7 of 91)

1. Using the cross-multiplication method, multiply both numerators by their opposite denominators: $1\times 91=7x$
2. Which gives: $91=7x$
3. Divide both sides by 7 to isolate x: $\frac{91}{7}=\frac{7x}{7}$
4. Which gives the result: $\frac{91}{7}=x$ (or $\frac{13}{1}=x$)

Thus, 1/7 of 91 is equal to 13/1 (or 13 in its decimal form).