# 6.RP.3c Percent's - Finding the whole when given the part and percent

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Lesson 2 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.

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This is the second of a series of 3 lessons on percent’s. Here we ask students to find the whole when given the part and the percent

The lesson problems for this lesson are:

At the Triumph dealership 60% of the motorcycles are black. If there are 180 black motorcycles at the dealership what is the total number of motorcycles?
[Demonstrate using a 20% strip model.]

Jen donated 25% of her weekly allowance to the local animal shelter. She donates \$2.25 each week. How much is her allowance?
[Demonstrate using a 25% strip model]
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12 pages
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1 hour
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