Percent and percent change

Front

What is a percent?

Back

A percent is a way to express a number as a fraction of 100. It is often used to compare values.

Front

How do you calculate percent change?

Back

Percent change is calculated using the formula: ((New Value - Old Value) / Old Value) x 100.

Front

If a price increases from $100 to $120, what is the percent change?

Back

20%.

Front

What does 40% of 200 mean?

Back

It means 40 out of every 100 parts of 200, which equals 80.

Front

How do you find the number of girls if 40% of 200 children are boys?

Back

If 40% are boys, then 60% are girls. 60% of 200 is 120 girls.

Front

What is the formula for finding the percent error?

Back

Percent error is calculated using the formula: (|Estimated Value - Actual Value| / Actual Value) x 100.

Front

If Mrs. Ciampa had 27 students last year and 30 this year, what is the percent change?

Back

11%.

Front

What is 30% of $30?

Back

$9.00.

Front

If a baseball cap costs $30 and you have a 30% coupon, how much do you pay?

Back

You pay $21.00.

Front

What is the percent error if Jessie estimated her cat's weight to be 8 pounds and it was actually 10 pounds?

Back

20%.