Solve 20/8-21/9=

$$20 / 8 - 21 / 9 =$$

Evaluate

$$\frac{1}{6}\approx 0.166666667$$

Solution Steps

Reduce the fraction \frac{20}{8} to lowest terms by extracting and canceling out 4.

$$\frac{5}{2}-\frac{21}{9}$$

Reduce the fraction \frac{21}{9} to lowest terms by extracting and canceling out 3.

$$\frac{5}{2}-\frac{7}{3}$$

Least common multiple of 2 and 3 is 6. Convert \frac{5}{2} and \frac{7}{3} to fractions with denominator 6.

$$\frac{15}{6}-\frac{14}{6}$$

Since \frac{15}{6} and \frac{14}{6} have the same denominator, subtract them by subtracting their numerators.

$$\frac{15-14}{6}$$

Subtract 14 from 15 to get 1.

$$\frac{1}{6}$$

Factor

$$\frac{1}{2 \cdot 3} = 0.16666666666666666$$