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Fractions of Sets

- By Mr. Bales

Objective

- By the end of this lesson, you will be able to

identify, read, write, and model fractions for

parts of a set. - Standard 4NS1.5 - Students will explain different

interpretations of fractions, for exampleparts

of a set, and division of whole numbers by whole

numbers.

Introduce

- If you had twenty pennies, and I asked you to

show 1/2 of the pennies, how many pennies would

that be?

Introduce

- Lets practice using fractions in our class.
- Everyone wearing pants head to the back of the

room on the tile. - What is the fraction of students wearing pants?

(remember the number for what you are looking for

goes on top of the fraction, and the total number

of students goes on the bottom of the fraction) - Lets try the same thing, but this time lets

look at all those that have short sleeves. - What fraction of the group is wearing short

sleeves?

Example

- Before we practice together, lets have Mrs.

Verughese show us an example of how to find a

fraction of a set!! - Mrs. Verughese!!
- Now a Game!!

Lets Practice Making Fractions of a Set

- In the middle of your table you will find a bunch

of cubes. Please take out 12 cubes and place on

your desk. - Next, count out 1/3 of those cubes.
- Note - The whole is 12 cubes, not one cube.
- Divide the cubes into three equal groups, or

three fair shares.

Sharing

- Natalie, how much is the whole?
- The cubes in each group represent what fraction

of all the cubes? - How many cubes are in each group?
- How much is 1/3 of 12 cubes?
- One way to find 1/3 of 12 is to first divide

the cubes into three equal groups. Then, you want

only 1 of those groups. How many is in that

group? - 4

More Practice

- Now using only 8 cubes instead of 12 show the

following - 1/4 of 8
- 1/2 of 8
- 3/4 of 8
- 6/8 of 8

- Now using 14 cubes show the following
- 1/7 of 14
- 3/7 of 14
- 5/7 of 14
- 14/14 of 14

Bales Bucks

- How much is
- 1/4 of 32 cents
- 1/5 of 30 cents
- 2/3 of 27 cents
- 2/4 of 32 cents
- 2/5 of 30 cents

- 5/6 of 30 cents
- 3/4 of 32 cents
- 4/5 of 30 cents
- 3/8 of 40 cents
- 6/7 of 42 cents
- 4/5 of 50 cents

Now Lets Combine Generalizations with Fractions

- Time to Move!!

Assignment

- Page 512 - s 8 - 17
- Get them all correct - No Math Homework