# How do you write 540, 000 in scientific notation?

$5 \times {10}^{5}$
The original number, $540 , 000$, has to be reduced so that it is less than $10$.
To do this, you have to move the decimal point back five places, so that the number becomes $5 \times {10}^{5}$. The exponent is positive, because the original number is greater than $1$.