STUDENT
TEACHER

Percentage Calculator

STUDENT
TEACHER

Percentage Calculator

# Percentages

CALCULATOR

## Percentage Calculator

What is of? We have some questions for you! Help us out through this
INTRO
The word percentage comes from the word percent, which means "per ." In other words, a percent tells us what amount out of we have.
Percentages are often used for grades. For example, if we get out of questions correct, our grade percentage would be . The percentage tells us how much of the test we got correct if the test were split into questions.
If we got a on a question test, then we got out of questions right.
In general, percentage problems involve proportions (equivalent ratios) between a given percent and a given part of a whole.
So a percentage problem like is really asking us, "What amount out of is equal to out of ?"

### What is a proportion?

A proportion is an equation that lets us know two ratios (or fractions) are equal.
For example:
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KEY STEPS

## How to Calculate Percentages

### Step 1. Change the percent into a fraction.

The percent tells us an amount out of . Remove the percent sign and place the number over .

### Step 2. Set up the proportion.

The percent over is equal to the part over the whole. Use a variable like for the value you're solving for.

### Step 4. Solve for the unknown.

LESSON
Calculating Percentages
PRACTICE
Calculating Percentages
CONCLUSION
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