Percent Proportions

Front

What is a percent?

Back

A percent is a ratio expressed as a fraction of 100. It represents a part of a whole.

Front

How do you calculate a percentage of a number?

Back

To calculate a percentage of a number, multiply the number by the percentage (in decimal form). For example, to find 25% of 200, calculate 200 x 0.25 = 50.

Front

What is the formula to find the percent of a part compared to a whole?

Back

The formula is: (Part/Whole) x 100 = Percent.

Front

If 25% of a class of 40 students are girls, how many girls are in the class?

Back

10 girls (40 x 0.25 = 10).

Front

What does it mean if a student scored 85% on a test?

Back

It means the student answered 85 out of 100 questions correctly.

Front

How do you convert a fraction to a percent?

Back

To convert a fraction to a percent, divide the numerator by the denominator and multiply by 100.

Front

What is the percent increase if a price goes from $50 to $75?

Back

The percent increase is 50% ((75-50)/50 x 100).

Front

If a student answered 18 out of 20 questions correctly, what is their percentage score?

Back

90% (18/20 x 100 = 90).

Front

What is the percent decrease if a product's price drops from $80 to $60?

Back

The percent decrease is 25% ((80-60)/80 x 100).

Front

How do you find the total amount if you know the percent of it?

Back

If you know the part and the percent, use the formula: Total = Part / (Percent/100).