Solve =(1.5*10^18+3.0*10^18)*1.6*10^-19

$$= ( 1.5 \times 10 ^ { 18 } + 3.0 \times 10 ^ { 18 } ) \times 1.6 \times 10 ^ { - 19 }$$

Evaluate

$$0.72$$

Solution Steps

Calculate 10 to the power of 18 and get 1000000000000000000.

$$\left(1.5\times 1000000000000000000+3\times 10^{18}\right)\times 1.6\times 10^{-19}$$

Multiply 1.5 and 1000000000000000000 to get 1500000000000000000.

$$\left(1500000000000000000+3\times 10^{18}\right)\times 1.6\times 10^{-19}$$

Calculate 10 to the power of 18 and get 1000000000000000000.

$$\left(1500000000000000000+3\times 1000000000000000000\right)\times 1.6\times 10^{-19}$$

Multiply 3 and 1000000000000000000 to get 3000000000000000000.

$$\left(1500000000000000000+3000000000000000000\right)\times 1.6\times 10^{-19}$$

Add 1500000000000000000 and 3000000000000000000 to get 4500000000000000000.

$$4500000000000000000\times 1.6\times 10^{-19}$$

Multiply 4500000000000000000 and 1.6 to get 7200000000000000000.

$$7200000000000000000\times 10^{-19}$$

Calculate 10 to the power of -19 and get \frac{1}{10000000000000000000}.

$$7200000000000000000\times \frac{1}{10000000000000000000}$$

Multiply 7200000000000000000 and \frac{1}{10000000000000000000} to get \frac{18}{25}.

$$\frac{18}{25}$$

Factor

$$\frac{2 \cdot 3 ^ {2}}{5 ^ {2}} = 0.72$$