What is 7/9 of 39?

How to calculate 7/9 of 39?

1. Multiply the whole number by the numerator of the fraction: 39 × 7 = 273
2. Divide this result by denominator of the fraction: 273/9 = 30.333333333333
3. Simplify by dividing both the numerator and denominator by their GCD (3):
   • 273/3 = 91
   • 9/3 = 3
4. Which gives: 91/3

Since 91/3 is an improper fraction, the result could also be expressed as a mixed number: 30 1/3

How does it work?

The principle behind finding a fraction of a number, such as 7/9 of 39, is rooted in the method of cross-multiplication.

Consider the following proportion: $\frac{7}{9}=\frac{x}{39}$ (where x represents 7/9 of 39)

1. Using the cross-multiplication method, multiply both numerators by their opposite denominators: $7\times 39=9x$
2. Which gives: $273=9x$
3. Divide both sides by 9 to isolate x: $\frac{273}{9}=\frac{9x}{9}$
4. Which gives the result: $\frac{273}{9}=x$ (or $\frac{91}{3}=x$)

Thus, 7/9 of 39 is equal to 91/3 (or 30.333333333333 in its decimal form).