How do you write 4 trillion in scientific notation?

May 30, 2015

$4.0 \cdot {10}^{12}$
Without scientific notation it would look like 4 000 000 000 000
The decimal place must be moved 12 units to the left to be after a significant figure, thus giving the scientific notation to the power of 12. The significant figure is 4 so you get the equation $4.0 \cdot {10}^{12}$.
Hope this helps!