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Compound interest builds on percentage multiplier methods to model growth and decay over time. Students apply repeated percentage change to financial contexts, population growth, and depreciation problems.
Our tutors see these errors again and again. Knowing them in advance gives you a head start.
Using simple interest calculations instead of compound (multiplying by n instead of raising to the power n)
Forgetting that a 3% increase uses a multiplier of 1.03, not 0.03
Not reading whether the question asks for the total amount or just the interest earned
This topic is tested by the following exam boards. Our tutors are specialists in each one.
Finding percentages of amounts is one of the most practical maths skills students learn. This includes calculating discounts, tax, tips, pay rises, and other real-world percentage applications that appear heavily in exam contexts.
NumberPercentages link directly to fractions and decimals and are tested extensively across all exam boards. Questions range from simple percentage-of-an-amount calculations to reverse percentages and repeated percentage change problems at higher tier.
NumberIndex laws are a core algebra and number skill tested at both foundation and higher tier. Higher-tier students must also handle negative and fractional indices, making this a topic that bridges number work with algebraic manipulation.
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Take our free diagnostic quiz to find out exactly where you stand, then get matched with a tutor who specialises in ratio, proportion & rates of change.