What is 9/9 of 91?

How to calculate 9/9 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: 819/9 = 91
3. Simplify by dividing both the numerator and denominator by their GCD (9):
   • 819/9 = 91
   • 9/9 = 1
4. Which gives: 91/1

How does it work?

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

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

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

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