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Percent

- Working with a unit square

http//illuminations.nctm.org/LessonDetail.aspx?ID

L249

What are 4 ways to write a number?

- Decimal
- 0.001
- Fraction
- 1/1000

- Percent
- 0.1
- Scientific Notation
- 1.?10-3

Introducing the Unit Square

- The unit square represents the whole (100)
- Each small box represents 1

10 Boxes

10 Boxes

What Percents are Represented?

And a Few More.

Using the Unit Square

- What quantity does the whole unit square

represent?

- What quantity does one small box represent?

Calculating Using the Unit Square

- How many people are represented by
- ½ the unit square?
- 20 small squares?
- 33.5 squares?

- What part of the unit square would represent
- 100 people?
- 48 people?
- 78 people?

Going the Other Way

- If you know the size of a small box you can find

the size of the unit square

2.5

- If 12 of the class is 30 people, 1 of the class

is 2.5 people, so the whole class (100) is 250

people.

So how much does it cost?

Is a discount of 30 off, followed by a discount

of 50, the same as a discount of 80 off the

initial price?

http//www.figurethis.org/challenges/c17/challenge

.htm

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