Percents Review

Front

What is a percent?

Back

A percent is a way of expressing a number as a fraction of 100. It is denoted by the symbol '%'. For example, 50% means 50 out of 100.

Front

How do you calculate the percent of a number?

Back

To calculate the percent of a number, divide the part by the whole and then multiply by 100. Formula: (Part/Whole) x 100.

Front

What is the formula for percent change?

Back

Percent Change = ((New Value - Old Value) / Old Value) x 100.

Front

If an electrician worked 7 months out of 12, what percent of the year did they work?

Back

58%.

Front

How do you find the percent error?

Back

Percent Error = (|Estimated Value - Actual Value| / Actual Value) x 100.

Front

Renee estimated it would take 95 minutes to run 7 miles but ran it in 80 minutes. What is her percent error?

Back

18.75%.

Front

If 60 people were expected to attend an event but only 45 did, what is the percent of error?

Back

33 1/3%.

Front

What is 35 as a percent of 45?

Back

78%.

Front

How do you calculate the percent of a total?

Back

To find the percent of a total, divide the part by the total and multiply by 100.

Front

This year, there are 900 7th graders, and last year there were 810. What is the percent of change?

Back

11%.