Probability and Fractions

By Mr. Bales

Objective

By the end of this lesson, you will be able to describe probability in words and numbers.

Standard 4SDAP2.2 - Students will express outcomes of experimental probability situations verbally and numerically (e.g., 3 out of 4, or 3/4)

Introduce

In this bowl, I have ten colored shapes. I have 7 blue, 2 red, and 1 yellow.

How likely is it that I will draw a yellow shape?How likely is it that I will draw a white shape?Fractions can be used to describe the

probability of an outcome.How many shapes are blue?How many total shapes are in the bowl?The probability of choosing a blue shape is

7/10.

Probability as a Fraction

Find Probability Use words and a fraction to describe the

probability of rolling a six on a die. One out of six numbers on a die is a six.

Probability = number of favorable outcomes total possible outcomes

Probability = number of 6’s total possibilities on die

= 1/6So, the probability of rolling a 6 on a die is 1 out of 6, or 1/6

Activity On your tables are three lunch bags with seven colored tiles in

them. I will not tell you how many of each color there are, and you MAY NOT PEEK!!

On the board, you will see that the bags contain a cure for a specific celebrity that has taken ill.

It is your goal to find out which bag belongs to which celebrity.

Rules: Start with one bag, and take turns in your group reaching in the

bag and taking a shape out, noting its color on your whiteboard, and put it back in the bag.

Record the colors as they are picked on your whiteboard. After each of you has drawn a tile or two from each bag, discuss

the results. Predict which sign you think matches the bag. Record your final prediction for your group on the front whiteboard.

Hi! Mr. Hardesty!!

Bales Bucks!!

Assignment

Page 638 - #’s 11 - 23Get them all correct - No Math

Homework