Solve 640*(1/8-1/10)

$$640 \times ( \frac{ 1 }{ 8 } - \frac{ 1 }{ 10 } )$$

Evaluate

$$16$$

Solution Steps

Least common multiple of 8 and 10 is 40. Convert \frac{1}{8} and \frac{1}{10} to fractions with denominator 40.

$$640\left(\frac{5}{40}-\frac{4}{40}\right)$$

Since \frac{5}{40} and \frac{4}{40} have the same denominator, subtract them by subtracting their numerators.

$$640\times \frac{5-4}{40}$$

Subtract 4 from 5 to get 1.

$$640\times \frac{1}{40}$$

Multiply 640 and \frac{1}{40} to get \frac{640}{40}.

$$\frac{640}{40}$$

Divide 640 by 40 to get 16.

$$16$$

Factor

$$2^{4}$$