Reading Strategy GRAPES Were $3.20 per Kg Now 25% off 25% off Design a Sign Save Supermarket is planning a super sale.. He used a percent discount and a percent bar to visually show t
Trang 1Mathematics
Reading 2
Read with a Purpose
Think about your
purpose for reading
How did it affect the
questions you asked
yourself about the
text?
Reading
Strategy
GRAPES
Were $3.20 per Kg
Now 25% off
25% off
Design a Sign
Save Supermarket is planning a super sale They want to design a sale sign showing the produce prices Ms Vander gives these discounts
1 Are these good sales for customers?
The employees brainstorm about what to write on the sale signs
Bert sketched this sign for grapes
He used a percent discount and a
percent bar to visually show the
relationship between the original price and the discount price
2 Sketch signs for Granny Smith
and Red Delicious apples using Bert’s suggestions
Janice proposes that they include fractions instead of percents
She believes customers can estimate the discounts more easily if they use fractions
3 a Reflect Do you agree with Janice? Defend your position
b Draw one sign using Janice’s suggestion.
Many Changes
Grapes Were $3.20/kg Now 25% off
Granny Smith Apples Were $2.89/kg Now 20% off
Red Delicious Apples Were $2.40/kg Now 15% off
Trang 2Reading Check ✓
1 Recall details
What items is Save Supermarket putting on sale?
2 Interpret What
does a percent bar show?
GRAPES
Were $3.20 per Kg
Now 25% off
Now $2.40 per kg
25% off
Ms Vander is in favor of displaying the discount in dollars.
Pedro thinks it will be easier for customers if only the new price appears on the signs
4 What kind of sign do you prefer? Why?
The employees decide to combine ideas They will use a percent bar, the percent discount, and both the original price and the sale price on each sign
5 Use their ideas to design new signs for each of the items
on the left
Pedro studies the new grapes sign and says, “This is great!
You can tell just by looking
at the sign what fraction or percent the customers will have to pay You can check the sale price by doing one simple multiplication.”
6 a What fraction and
percent of the original price do customers have to pay for grapes?
b What multiplication can customers use to check the
sale price for grapes?
c Compute the new prices for the Granny Smith and
Red Delicious apples using only one multiplication for each
Grapes
Were $3.20/kg
Now 25% off
Granny Smith
Apples
Were $2.89/kg
Now 20% off
Red Delicious
Apples
Were $2.40/kg
Now 15% off
Read with a Purpose
How did your purpose for reading affect the information you focused on or didn’t focus on?
Reading Strategy
Trang 3Read with a Purpose
What prior knowledge
did you use as you
read this page? How
would your answer
be different if your
purpose for reading
were to learn about
sales instead of math?
Reading
Strategy
APPLES Were $2.89/kg Now 20% off
STRAWBERRIES Were $3.30/kg Now 15% off
Understanding the concept of percentages is important to both buyers and sellers It allows sellers to determine how much of a
discount to provide and how to display the discount It allows buyers
to compare the regular price to the discount price and figure out how much money they can save
The Importance of Understanding Percentages
Use what you learned about percent changes to calculate the sale price of apples and strawberries Then create a percent bar for each