Grade 7 · Unit 2Topic 3 of 3~24 min

Percent Problems

Solve tax, tip, discount, markup, and percent-change problems.

Step 1 · Learn

Walkthrough

Read this first — it covers the idea in plain language with a worked example.

To find a percent of a number, change the percent to a decimal and multiply. 25% = 0.25, so 25% of 80 is 0.25 × 80 = 20.

Worked example

A $40 shirt is 30% off. What is the sale price?

Percent change

Percent change = (amount of change ÷ original amount) × 100. Increase is positive; decrease is negative.

Step 2 · Watch

Watch the main video, then check the second take if you want another explanation.

Math Antics

Two methods for finding a percent of any amount.

Math Antics

The formula for percent increase and decrease.

Step 3 · Practice

Try a worksheet or work through some problems before the quiz.

Step 4 · Check

A couple of questions to make sure this topic stuck. Retake as many times as you want.

Percent Problems

Easy

A $60 jacket is marked up 20%. What is the new price?