Year 9 - Simple interest - Free practice
Year 9 Simple Interest Worksheets
I = PRT - the Year 9 financial maths foundation.
Generate a free maths worksheet
10 questions — 4 Foundation, 4 Standard, 2 Extension — with full worked solutions, calibrated to the Victorian Curriculum.
About this worksheet
Why we built it
Year 9 students should be comfortable with the simple interest formula in both directions - finding the interest, and rearranging for principal, rate or time. These worksheets give your student a steady set of applied problems across each variation.
What's covered
Sub-skills your student will practise
- ✓Calculating simple interest using I = PRT
- ✓Rearranging for principal, rate or time
- ✓Converting between annual and monthly rates
- ✓Total amount = P + I problems
- ✓Comparing simple interest scenarios
More Year 9 topics
Other free Year 9 worksheet generators
Year 9
Quadratics
Year 9
Algebra
Year 9
Linear equations and graphs
Year 9
Trigonometry
Year 9
Pythagoras (applied)
Year 9
Surface area and volume
Year 9
Coordinate geometry
Year 9
Exponent laws
Year 9
Scientific notation
Year 9
Statistics
Year 9
Probability
Or generate any topic from the full worksheet builder.
Frequently asked
Questions parents ask about simple interest
What's simple interest?
Interest calculated only on the original principal, not on accumulated interest. Formula: I = PRT, where P is the principal, R is the rate per year, and T is the time in years.
How does simple interest differ from compound interest?
Simple interest grows linearly (same dollar amount each year). Compound interest grows exponentially (each year's interest earns interest in subsequent years). Year 10 covers compound; Year 9 stays with simple.
How is the rate expressed in the formula?
As a decimal, not a percentage. A 5% rate becomes 0.05 in the formula. Forgetting to convert is the most common Year 9 simple-interest error.
Do students need to rearrange the formula?
Yes. Given any three of the four variables, students should be able to solve for the fourth. So 'find the principal needed to earn $500 interest at 4% over 2 years' is a standard Year 9 question.
Want a real plan for the term?
Worksheets are great for repetition. A Tuterly tutor can spot the specific moves your student keeps getting wrong and fix them in one or two sessions.
Talk to a human
Talk to us about Year 9 simple interest.
Call or message us with your student's year level and what's tripping them up - we'll point you to the right tutor.