Percentages & Financial Maths — Year 8 Practice Questions
Work through these Year 8 practice questions on percentages and financial maths. Try each one before revealing the worked solution.
Questions
Find 25% of 80.
Find 10% of 350.
Increase 60 by 20%.
Decrease 90 by 30%.
A jacket costing $50 is reduced by 15% in a sale. Find the sale price.
A test score rises from 40 to 50 marks. Find the percentage increase.
Write 18 out of 24 as a percentage.
$200 is invested at 5% simple interest per year. Find the interest earned after 3 years.
Answers & Worked Solutions
Question 1 Solution
Step 1: 25% = 0.25.
Step 2: 0.25 × 80 = 20.
Answer: 20
Question 2 Solution
Step 1: 10% means divide by 10.
Step 2: 350 ÷ 10 = 35.
Answer: 35
Question 3 Solution
Step 1: 20% of 60 = 12.
Step 2: 60 + 12 = 72 (or 60 × 1.2 = 72).
Answer: 72
Question 4 Solution
Step 1: 30% of 90 = 27.
Step 2: 90 − 27 = 63 (or 90 × 0.7 = 63).
Answer: 63
Question 5 Solution
Step 1: 15% of 50 = 7.50.
Step 2: 50 − 7.50 = $42.50.
Answer: $42.50
Question 6 Solution
Step 1: The change is 50 − 40 = 10.
Step 2: 10 ÷ 40 × 100 = 25%.
Answer: 25%
Question 7 Solution
Step 1: 18 ÷ 24 = 0.75.
Step 2: 0.75 × 100 = 75%.
Answer: 75%
Question 8 Solution
Step 1: 5% of 200 = 10 per year.
Step 2: 10 × 3 years = $30.
Answer: $30
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