# What is the scientific notation of 0.01?

$1 \cdot {10}^{-} 2$
You choose the $10$-power, so that the number in front of the power is between 1 and 10 (10 not included), or $1 \le a < 10$
Since ${10}^{-} 2$ represents $1 / 100$ that was the right one to pick.
If the question had been to put 0.01234 in scientific notation, you would still pick ${10}^{-} 2$ to get $1.234 \cdot {10}^{-} 2$