PERCENTS AND PERCENT OF CHANGE

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 percent error?

Back

Percent error = |(Estimated Value - Actual Value)| / Actual Value × 100%.

Front

What is the formula for percent of change?

Back

Percent of change = (New Value - Original Value) / Original Value × 100%.

Front

If a class has 35 students and decreases to 28, what is the percent of change?

Back

20%.

Front

What does it mean if 60% of students play woodwind instruments?

Back

It means that 60 out of every 100 students in the band play woodwind instruments.

Front

How do you find the total number of students if 60% equals 45?

Back

Total students = 45 / 0.60 = 75.

Front

What is the tax amount on a $899 TV with a 6.5% tax rate?

Back

Tax amount = $899 × 0.065 = $58.43.

Front

If 48% of a number is 120, how do you find the number?

Back

Number = 120 / 0.48 = 250.

Front

What is the relationship between fractions and percents?

Back

Percents are fractions with a denominator of 100.

Front

How do you convert a percent to a decimal?

Back

To convert a percent to a decimal, divide by 100 (e.g., 25% = 0.25).