Applications of Ratio and Percent
Presentation
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Mathematics
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7th Grade
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Hard
Joseph Anderson
FREE Resource
21 Slides • 12 Questions
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Percent Applications - Find Amount, then what?
Keep it, Add it, Subtract it -- it depends upon the Question.
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Shopping
"on sale" discounts reduce the price paid.
"tax" calculated using subtotal increasing total amount paid.
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Receipt details
Where did the customer shop?
What was purchased?
How much was 1 cup?
What is the discount rate?
How much was the discount/savings?
What was the price before tax?
What was the tax rate (%)?
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Interpreting Receipts
The yellow star shows the discount RATE as a percent, 25%
The blue lightening bolt shows the discount AMOUNT, ($32.50)
This discount AMOUNT was calculated by changing percent to decimal and then multiplying 130(.25) = $32.50
The subtotal $97.50 is the sales price. 130 - 32.50 = 97.50
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Interpreting Receipts
The purple circle shows where the sales tax was entered.
The Sales Tax AMOUNT is $7.80
The Sales Tax rate (%) is not listed, but may be computed.
Tax RATE 7.80/97.50 = 0.08 or 8%
The tax AMOUNT of $7.80 was added to the Subtotal of $97.50
7.80 + 97.50 = 105.30
Total amount paid was $105.30
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Real life percent problems - markdowns, markups, tax, gratuities (tips), fees and commission may be multi-step problems
A defined structure may serve to keep your work organized.
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Multiple Select
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Multiple Choice
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Multiple Choice
Percent Applications - Find Amount, then what?
Keep it, Add it, Subtract it -- it depends upon the Question.
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