Do I need an account to practise Simple interest?

No. You can start practising Simple interest straight away without an account. A free account keeps your results across sessions, so you can see your progress on this topic over time.

Financial Maths

Simple interest

Q: What are the common mistakes in Simple interest?

Misapplies the relationship between the parts of a ratio Divides total simple interest by a single year's rate instead of the full rate over the stated number of years Gives an intermediate value (e.g. before the final division/simplification) as the final answer

12 self-marking GCSE and IGCSE practice questions on Simple interest, written specifically for AQA, Pearson, OCR, Pearson International GCSE Maths A (4MA1), Cambridge IGCSE Mathematics (0580), Cambridge IGCSE (9-1) Mathematics (0980) across Foundation and Higher and Core and Extended tier. Instant marking with full worked solutions on every question.

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Sample Simple interest questions

A few of the 12 questions, from easier to harder. Choose your exam board and tier to practise them, with every answer marked.

Question 12 marksGrade 3
£1700 is invested for 3 years at 4% per year simple interest. Work out the total interest.
Show the worked solution
Simple interest per year: 4% of £1700 = £68. M1
Over 3 years: £68 × 3 = £204. A1
Question 22 marksGrade 4-5
Kai invests £1290 in a savings account paying 10% simple interest per year. Work out the total value of the investment after 5 years.
Show the worked solution
Find the interest earned in ONE year: $\frac{10}{100} \times 1290 = £129$

What are the common mistakes in Simple interest?

When a pupil makes one of these on Revision Workshop, the marking engine names the mistake and explains it, instead of just marking the answer wrong.

Misapplies the relationship between the parts of a ratio
Tried to find a compound annual rate (as if interest compounded each year) instead of recognising simple interest grows by the same flat amount every year - this gives the wrong, smaller rate
Divides total simple interest by a single year's rate instead of the full rate over the stated number of years
Treats the total £150 interest as if it were earned from a single year at 5%, computing £150 ÷ 0.05 = £3000, instead of dividing by the full 2-year rate of 10% to get £1500.
Gives an intermediate value (e.g. before the final division/simplification) as the final answer
Found the total interest earned (£180) but treated that as the final answer, instead of adding it to the original £1800 to give the total value of the investment

Quick answers about Simple interest

How many Simple interest practice questions are there?: There are 12 self-marking GCSE and IGCSE Maths questions on Simple interest, written for AQA, Pearson, OCR, Pearson International GCSE Maths A (4MA1), Cambridge IGCSE Mathematics (0580), Cambridge IGCSE (9-1) Mathematics (0980) across Foundation and Higher and Core and Extended tier. Each one is marked instantly and has a full worked solution.
Do I need an account to practise Simple interest?: No. You can start practising Simple interest straight away without an account. A free account keeps your results across sessions, so you can see your progress on this topic over time.