10% of $300 is $30.00.

Suppose you are at the store, and you see that a pressure cooker you've had your eye on for a while just went on sale. The original price is $300, and it is on sale for 10% off. To find out the amount of the discount, we need to find 10% of $300.

10% is a special percent in that to calculate 10% of a number, x, all we have to do is move the decimal point in x one place to the left. Therefore, to calculate 10% of $300, we just need to move the decimal point in $300 one place to the left to get $30.0, or $30.

Therefore, we find that 10% of $300 is $30, and this is the amount of the discount you will receive if you buy the pressure cooker.