How do you find the percent of a number when the percent and number both ends with a zero?
Given 20 and 50%, multiply 20 by 0.5, which equals 10.
Given 70 and 30%, multiply 70 by 0.3, which equals 21.
Or if you prefer, given 20 and 50%, multiply 2 by 5, which
equals 10.
Or if you prefer, given 70 and 30%, multiply 7 by 3, which
equals 21.