We want to find the number which is 20% of 80 by using a model. We can split the model into 20% intervals. There are 5 such intervals in 100%, which represents the whole 80. Let's find 20% of 80!
We found that 16 is 20 % of 80.
Checking Our Answer
We can check our answer by solving the percent proportion. The percent proportion is a proportion that sets the ratio of a part of a whole equal to the ratio of a percent out of 100. We can represent a is p percent of wwith the given proportion.
part/whole=percent/100 ⇔ a/w=p/100
We can find what 20% of 80 is by thinking about 20 as the percent and 80 as the whole. Let's substitute p= 20 and w= 80 into the formula and solve for a using the Properties of Equality.
