Solve 81-9div8+7-5*2

$$81 - 9 \div 8 + 7 - 5 \times 2$$

Evaluate

$$\frac{615}{8}=76.875$$

Solution Steps

Convert 81 to fraction \frac{648}{8}.

$$\frac{648}{8}-\frac{9}{8}+7-5\times 2$$

Since \frac{648}{8} and \frac{9}{8} have the same denominator, subtract them by subtracting their numerators.

$$\frac{648-9}{8}+7-5\times 2$$

Subtract 9 from 648 to get 639.

$$\frac{639}{8}+7-5\times 2$$

Convert 7 to fraction \frac{56}{8}.

$$\frac{639}{8}+\frac{56}{8}-5\times 2$$

Since \frac{639}{8} and \frac{56}{8} have the same denominator, add them by adding their numerators.

$$\frac{639+56}{8}-5\times 2$$

Add 639 and 56 to get 695.

$$\frac{695}{8}-5\times 2$$

Multiply 5 and 2 to get 10.

$$\frac{695}{8}-10$$

Convert 10 to fraction \frac{80}{8}.

$$\frac{695}{8}-\frac{80}{8}$$

Since \frac{695}{8} and \frac{80}{8} have the same denominator, subtract them by subtracting their numerators.

$$\frac{695-80}{8}$$

Subtract 80 from 695 to get 615.

$$\frac{615}{8}$$

Factor

$$\frac{3 \cdot 5 \cdot 41}{2 ^ {3}} = 76\frac{7}{8} = 76.875$$