How do you find 30 percent of a number?

To find 30 percent of a number, multiply that number by 0.30

For mental arithmetic it is sometimes easier to divide the number by 100 (to calculate 1%) then multiplying by 30 (for 30%). Simply put move the decimal point of the required percentage two spaces to the right ( to get 1%) and multiply the amount of 1% by the percent wanted.

For example:

43 % of 3300 = 0.43 x 3300 = 1419

30 % of 450 = 0.3 x 450 = 135