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YEAR 9 · HIGH SCHOOL MATHEMATICS

Financial mathematics.

Use percentages, simple interest, budgets and linear/quadratic models to make and check financial calculations.

6 lessons3 practice tests

Work through the topic

Learn the method, follow the examples, then try the worksheet.

01
Percentage change consolidation
Use percentage multipliers and the original amount to compare financial changes.
15 min · Worked examples & worksheet
02
Simple interest
Calculate simple interest using one unchanged principal, and rearrange the model.
15 min · Worked examples & worksheet
03
Comparing linear growth/cost models
Compare a fixed fee plus a rate, and interpret where two straight-line models agree.
15 min · Worked examples & worksheet
04
Budgeting and financial assumptions
Create a budget from supplied amounts, then test whether it remains affordable.
15 min · Worked examples & worksheet
05
Interpreting linear versus quadratic financial models
Tell linear and quadratic financial rules apart and interpret what each assumes.
15 min · Worked examples & worksheet
06
Checking whether a model's answer makes practical sense
Check financial answers against units, domains, precision and the assumptions of a model.
15 min · Worked examples & worksheet

AFTER THE LESSONS

Topic review

Revisit the key ideas, then choose a practice paper.

3 practice tests · Separate worked marking guides