Question

which expression uses a common denominator to rewrite \\(\frac{1}{3} - \frac{1}{9}\\)? \\(\frac{3}{3} - \frac{1}{3}\\) \\(\frac{9}{1} - \frac{3}{1}\\) \\(\frac{9}{9} - \frac{1}{9}\\) \\(\frac{3}{9} - \frac{1}{9}\\)

Explanation:

Step1: Find common denominator

The denominators are 3 and 9; common denominator is 9.

Step2: Rewrite first fraction

$\frac{1}{3} = \frac{1×3}{3×3} = \frac{3}{9}$

Step3: Rewrite the subtraction

$\frac{3}{9} - \frac{1}{9}$ matches the last option.

Answer:

$\frac{3}{9} - \frac{1}{9}$