Proportions and Percentages

Front

What is a proportion?

Back

A proportion is an equation that states that two ratios are equal.

Front

How do you calculate percent error?

Back

Percent error is calculated using the formula: Percent Error = |(Estimated Value - Actual Value)| / Actual Value * 100%.

Front

What is a percentage?

Back

A percentage is a fraction expressed as a part of 100.

Front

If 20 out of 100 students passed a test, what is the percentage of students who passed?

Back

20% of students passed the test.

Front

What is the formula to find the total cost when given a price per unit?

Back

Total Cost = Price per Unit * Number of Units.

Front

If a shirt costs $40 and is on sale for 25% off, what is the sale price?

Back

The sale price is $30.

Front

What is the relationship between fractions and percentages?

Back

Fractions can be converted to percentages by multiplying by 100.

Front

If a car travels 60 miles in 1 hour, what is its speed in miles per hour?

Back

The speed is 60 miles per hour.

Front

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

Back

The percent increase is 50%.

Front

If you have 30% of a pizza left and the pizza was originally 12 slices, how many slices are left?

Back

There are 3.6 slices left, which can be rounded to 4 slices.