7th Grade Percent Proportions Flashcard

Front

What is a percent proportion?

Back

A percent proportion is a way to express a relationship between a part and a whole in terms of percentage. It is often used to solve problems involving discounts, sales tax, and comparisons.

Front

How do you calculate the number of correct answers if you scored a certain percentage on a test?

Back

To find the number of correct answers, multiply the total number of questions by the percentage (as a decimal). For example, if you scored 85% on a 50-question test: 50 x 0.85 = 42.5, round to the nearest whole number.

Front

If 20% of a class are girls and there are 30 students, how many girls are there?

Back

To find the number of girls, multiply the total number of students by the percentage of girls: 30 x 0.20 = 6.

Front

What is the sale price of an item after a percentage discount?

Back

To find the sale price, subtract the discount amount from the original price. For example, if a shirt costs $40 and is 25% off: Discount = 40 x 0.25 = $10; Sale Price = 40 - 10 = $30.

Front

How do you convert a fraction to a decimal?

Back

To convert a fraction to a decimal, divide the numerator by the denominator. For example, 3/5 = 3 ÷ 5 = 0.6.

Front

What is the formula to find the percentage of a number?

Back

The formula to find the percentage of a number is: (Part/Whole) x 100. For example, if you have 10 out of 50, the percentage is (10/50) x 100 = 20%.

Front

How do you find the original price before a discount?

Back

To find the original price, divide the sale price by (1 - discount rate). For example, if a car is sold for $17,000 after a 15% discount: Original Price = 17000 / (1 - 0.15) = $20,000.

Front

What does it mean to find a percentage of a total?

Back

Finding a percentage of a total means calculating how much a certain percentage represents in terms of the total amount. For example, 25% of 200 is 200 x 0.25 = 50.

Front

How do you express a decimal as a percent?

Back

To express a decimal as a percent, multiply the decimal by 100 and add a percent sign. For example, 0.6 x 100 = 60%.

Front

What is the relationship between fractions, decimals, and percents?

Back

Fractions, decimals, and percents are different ways to represent the same value. For example, 1/2 = 0.5 = 50%.