Lesson 3 of 3
A percent is a ratio that compares a number to 100. The symbol % is used to show a percent. Keep reiterating this point to students. Ideally, percent’s should come at the end of RP lessons and after NS.1 so students have worked with strip diagrams before.
Provide benchmarks for strip diagrams determined by the factor pairs that make 100. Factor pairs of 100, number of (boxes) x (percentage worth of each box)
1x100, 2x50, 4x25, 5x20, and 10x10.
This lesson includes:
This is the third of a series of 3 lessons on percent’s. Here we ask students to find the percent of a quantity as a rate per 100.
The lesson problems for this lesson are:
Last month Jessica drank 15 Pumpkin Spice lattes and 45 dark roast coffees. What percent of the coffees were dark roast?
[Demonstrate using a proportional relationship.]
Nick has a total of 240 stuffed animals on his bed. 33% are stuffed kittens, 22% are teddy bears, 15% are stuffed ponies and the rest of the animals are from zebras. How many of the stuffed animals are zebras?
[Demonstrate using a strip model. Students should understand that the difference between 100 and the sum of the given percent’s is the quantity that they are looking for.]