Solve 1/2-42/5

$$\frac { 1 } { 2 } - 4 \frac { 2 } { 5 }$$

Evaluate

$$-\frac{39}{10}=-3.9$$

Solution Steps

Multiply 4 and 5 to get 20.

$$\frac{1}{2}-\frac{20+2}{5}$$

Add 20 and 2 to get 22.

$$\frac{1}{2}-\frac{22}{5}$$

Least common multiple of 2 and 5 is 10. Convert \frac{1}{2} and \frac{22}{5} to fractions with denominator 10.

$$\frac{5}{10}-\frac{44}{10}$$

Since \frac{5}{10} and \frac{44}{10} have the same denominator, subtract them by subtracting their numerators.

$$\frac{5-44}{10}$$

Subtract 44 from 5 to get -39.

$$-\frac{39}{10}$$

Factor

$$-\frac{39}{10} = -3\frac{9}{10} = -3.9$$