How do you calculate percent error?

Percent error can be calculated using the formula: $$percent\ error = \frac{|true\ value - measured\ value|}{true\ value} \times 100%$$ .

If the price of a hat after a 20% discount is $18, how do you find the original price?

To find the original price, use the formula: $$original\ price = \frac{discounted\ price}{1 - discount\ rate} = \frac{18}{0.8} = 22.50$$ .

What is the relationship between original price and discounted price?

The relationship can be expressed as: $$d = p(1 - r)$$ where d is the discounted price, p is the original price, and r is the discount rate.

What does it mean if an item is 7% longer than another?

It means the item is 7% more than the original item's length, calculated as: $$length_{new} = length_{original} + (length_{original} \times 0.07)$$ .

How do you express a 20% discount as a decimal?

A 20% discount can be expressed as a decimal by dividing by 100, which gives 0.20.

What is the formula for finding the new price after a percentage increase?

The formula for finding the new price after a percentage increase is: $$new\ price = original\ price + (original\ price \times \frac{percentage}{100})$$ .

If a car is 160 inches long, how do you find the length of a truck that is 7% longer?

Calculate the truck's length using: $$length_{truck} = 160 + (160 \times 0.07) = 171.2 inches$$ .

What is the significance of understanding proportional relationships in real life?

Understanding proportional relationships helps in making informed decisions in finance, cooking, construction, and many other areas where ratios and percentages are used.

Unit 4, Proportional Relationships and Percentages Flashcards

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15 questions

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1.

FLASHCARD QUESTION

Front

What is a proportional relationship?

Back

A proportional relationship is a relationship between two quantities where the ratio of one quantity to the other is constant.

Tags

CCSS.7.RP.A.2A

2.

FLASHCARD QUESTION

Front

Define percentage.

Back

A percentage is a fraction expressed as a part of 100, representing how much of one quantity is contained in another.

3.

FLASHCARD QUESTION

Front

What does a 20% discount mean?

Back

A 20% discount means that the price of an item is reduced by 20% of its original price.

Tags

CCSS.6.RP.A.3C

4.

FLASHCARD QUESTION

Front

How do you calculate the discounted price of an item?

Back

Tags

CCSS.6.RP.A.3C

5.

FLASHCARD QUESTION

Front

What is the formula to find the length of an item that is a certain percentage longer than another?

Back

Tags

CCSS.6.RP.A.3C

6.

FLASHCARD QUESTION

Front

If a pencil is 120 mm long and a marker is 9% longer, how do you find the length of the marker?

Back

Tags

CCSS.6.RP.A.3C

7.

FLASHCARD QUESTION

Front

What is percent error?

Back

Percent error is a measure of how inaccurate a measurement is, expressed as a percentage of the true value.

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