Reduce or Enlarge When looking at pictures sometimes they must be reduced or enlarged to fit a certain purpose In the example below the picture on the right is the original The picture on the left needed to be resized in order to fit on a flyer ID: 538581
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Slide1
Ratios and Proportions Notes-Part 6Slide2
Reduce or EnlargeWhen looking at pictures, sometimes they must be reduced or enlarged to fit a certain purpose. In the example below, the picture on the right is the original. The picture on the left needed to be resized in order to fit on a flyer
.Slide3
Reduce or EnlargeIs the
change a reduction or an enlargement? By what percent?
What does it mean to reduce to 25% or enlarge to 400%?Slide4
Reduce or EnlargeThe printer has gone to a lot of trouble to find the effect of a reduction. It would be a lot easier if the print shop had a chart that shows the measurements of an object after it is reduced.Slide5
Reduce or EnlargeHow can a calculator be used to find a reduction of 30% Use arrow language to show the process.Slide6
Reduce or Enlarge
The city wants to make a poster using the original picture. This time the picture has to be enlarged. Find the dimensions of a picture 10 centimeters (cm) by 15 cm enlarged to 200%. Show your calculations
.
Suppose you want to make an enlargement to 200%. The photocopier you are using enlarges to only 150%.
Will two enlargements to 150% give the desired result? Explain.
Find two enlargements that can be used with this photocopier to produce a final enlargement as close as possible to 200%. Copy the arrow string to describe your result.Slide7
Discounts
The city manager went to the Office Supply Store to buy a frame for the new subway poster. There were several frames for sale. He liked the picture shown below
.
What
is the discount in dollars?
The
city manager calculated the discount with one multiplication:
0.25
x 12.80. Is this correct? Explain.
What multiplication sentence could be used to calculate the sale price?Slide8
Sales Tax
The city manager paid more than $9.75 for the frame. When they looked at the bill, they noticed a sales tax added to their purchase. Sales taxes help pay for local community services.
In many cities, the sales tax is 8%. So, for an item priced at $20, you would pay $20 plus 8% of 20.Slide9
Sales Tax
Strategy 1: Ratio Table
Use the ratio table to calculate 8% sales tax on a $20
purchaseSlide10
Sales Tax
Strategy 2: Percent Bar
Use the
Percent Bar to calculate 8% Sales Tax on a $20 purchase.Slide11
Sales Tax
Strategy 3: Arrow Language
Use the
Percent Bar to calculate 8% Sales Tax on a $20 purchase.Slide12
Sales Tax
What fraction corresponds to 8%?
What decimal corresponds to 8%?
How could you use multiplication to find the total cost of a bill with 8% sales tax?Slide13
Sales Tax
Fill in the table below. Use a sales tax of 19%Slide14
Sales Tax
The city manager stopped for groceries on his way home. He bought the following items. The sales tax is 8%. What was the total cost of his trip to the grocery store?