Solve 7*10^-5+8.9*10^-9-3*10^-5=

$$7 \times 10 ^ { - 5 } + 8.9 \times 10 ^ { - 9 } - 3 \times 10 ^ { - 5 } =$$

Evaluate

$$0.0000400089$$

Solution Steps

Calculate 10 to the power of -5 and get \frac{1}{100000}.

$$7\times \frac{1}{100000}+8.9\times 10^{-9}-3\times 10^{-5}$$

Multiply 7 and \frac{1}{100000} to get \frac{7}{100000}.

$$\frac{7}{100000}+8.9\times 10^{-9}-3\times 10^{-5}$$

Calculate 10 to the power of -9 and get \frac{1}{1000000000}.

$$\frac{7}{100000}+8.9\times \frac{1}{1000000000}-3\times 10^{-5}$$

Multiply 8.9 and \frac{1}{1000000000} to get \frac{89}{10000000000}.

$$\frac{7}{100000}+\frac{89}{10000000000}-3\times 10^{-5}$$

Add \frac{7}{100000} and \frac{89}{10000000000} to get \frac{700089}{10000000000}.

$$\frac{700089}{10000000000}-3\times 10^{-5}$$

Calculate 10 to the power of -5 and get \frac{1}{100000}.

$$\frac{700089}{10000000000}-3\times \frac{1}{100000}$$

Multiply 3 and \frac{1}{100000} to get \frac{3}{100000}.

$$\frac{700089}{10000000000}-\frac{3}{100000}$$

Subtract \frac{3}{100000} from \frac{700089}{10000000000} to get \frac{400089}{10000000000}.

$$\frac{400089}{10000000000}$$

Factor

$$\frac{3 \cdot 193 \cdot 691}{2 ^ {10} \cdot 5 ^ {10}} = 4.00089 \times 10^{-5}$$