## Elementary Algebra

2.7 $\times$ $10^{-4}$
We need to write 0.00027 as the product of a number greater than or equal to 1 and less than 10, and an integral power of 10. The number greater than or equal to 1 and less than 10 will be 2.7 The decimal point has moved 4 places to the left, so the exponent of 10 will be -4. So, 0.00027 = 2.7 $\times$ $10^{-4}$