What is 9/7 of 91?

How to calculate 9/7 of 91?

1. Multiply the whole number by the numerator of the fraction: 91 × 9 = 819
2. Divide this result by denominator of the fraction: 819/7 = 117
3. Simplify by dividing both the numerator and denominator by their GCD (7):
   • 819/7 = 117
   • 7/7 = 1
4. Which gives: 117/1

How does it work?

The principle behind finding a fraction of a number, such as 9/7 of 91, is rooted in the method of cross-multiplication.

Consider the following proportion: $\frac{9}{7}=\frac{x}{91}$ (where x represents 9/7 of 91)

1. Using the cross-multiplication method, multiply both numerators by their opposite denominators: $9\times 91=7x$
2. Which gives: $819=7x$
3. Divide both sides by 7 to isolate x: $\frac{819}{7}=\frac{7x}{7}$
4. Which gives the result: $\frac{819}{7}=x$ (or $\frac{117}{1}=x$)

Thus, 9/7 of 91 is equal to 117/1 (or 117 in its decimal form).