← Change Topic

Percentages — change, discount, interest

Percent change (increase and decrease), discounts, tax and tips, simple interest, percent error of measurement, and per mille.

📄 Generate Exam

Available exercises

Percent change (increase / decrease)

Given an old and a new value, work out the percent change.

→ Start exercise

Percent of an amount — discount, tax, tip

Work out the final price after a discount, tax or tip.

→ Start exercise

Simple interest

Given the principal, an annual rate and a number of years, compute the interest.

→ Start exercise

📚 Want to learn more?