Understanding Percentages and Base Calculations

The video tutorial explains how to calculate the pre-tax price of tile supplies given the total bill including tax. It uses the percent equation, where the total amount is 108% of the pre-tax price. The tutorial walks through converting the percentage to a decimal and solving the equation using long division to find the original price before tax. The final result shows that the tile supplies cost $90 before tax.

What was the total amount Evelyn paid, including tax?

• $90.00

• $97.20

• $100.00

• $108.00

Tags

CCSS.6.RP.A.3C

What percentage of the original price does the total amount represent?

• 108%

• 110%

• 105%

• 100%

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CCSS.7.RP.A.2C

In the percent equation, what does the 'base' represent?

• The tax amount

• The total amount including tax

• The original price before tax

• The percentage of tax

How do you convert a percentage to a decimal?

• Divide by 10

• Add a zero at the end

• Move the decimal point two places to the left

• Move the decimal point one place to the right

What is the decimal equivalent of 108%?

• 108.0

• 10.8

• 0.108

• 1.08

Tags

CCSS.5.NBT.B.6

CCSS.6.NS.B.2

What is the first step in performing long division for this problem?

• Multiply the divisor by 10

• Move the decimal in the divisor to make it a whole number

• Add zeros to the dividend

• Subtract the divisor from the dividend

Tags

CCSS.4.NBT.B.6

How many times does 108 go into 972?

• 8 times

• 11 times

• 10 times

• 9 times

Tags

CCSS.6.NS.B.3

What is the result of dividing 97.2 by 1.08?

• 85

• 90

• 95

• 80

Tags

CCSS.6.RP.A.3C

What was the original price of the tile supplies before tax?

• $85.00

• $90.00

• $100.00

• $95.00

Tags

CCSS.6.NS.B.3

What is the final conclusion of the calculation?

• The tile supplies were $100.00 before tax

• The tile supplies were $108.00 before tax

• The tile supplies were $90.00 before tax

• The tile supplies were $97.20 before tax

Tags

CCSS.6.NS.B.3