Solve 15div8-31/5

$$15 \div 8 - 3 \frac { 1 } { 5 }$$

Evaluate

$$-\frac{53}{40}=-1.325$$

Solution Steps

Multiply 3 and 5 to get 15.

$$\frac{15}{8}-\frac{15+1}{5}$$

Add 15 and 1 to get 16.

$$\frac{15}{8}-\frac{16}{5}$$

Least common multiple of 8 and 5 is 40. Convert \frac{15}{8} and \frac{16}{5} to fractions with denominator 40.

$$\frac{75}{40}-\frac{128}{40}$$

Since \frac{75}{40} and \frac{128}{40} have the same denominator, subtract them by subtracting their numerators.

$$\frac{75-128}{40}$$

Subtract 128 from 75 to get -53.

$$-\frac{53}{40}$$

Factor

$$-\frac{53}{40} = -1\frac{13}{40} = -1.325$$