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Percentages, Ratios and Proportions

➕ Mathematics 📋 JSS2 📅 Second Term ⏱ ~20 min 📝 5 quiz questions
📖 Content 📝 Quiz (5)

Percentages

A percentage means "out of 100". The symbol is %.

Converting Fractions to Percentages

Multiply the fraction by 100:
3/4 × 100 = 75%
1/5 × 100 = 20%

Finding a Percentage of a Quantity

What is 30% of 200?
30/100 × 200 = 60

Percentage Increase and Decrease

Percentage increase = (Increase ÷ Original) × 100
A price rises from ₦500 to ₦600. Increase = 100. % increase = 100/500 × 100 = 20%

Ratio

A ratio compares two or more quantities. A:B = A to B.
Share ₦720 in ratio 3:5:
Total parts = 8. Each part = 720 ÷ 8 = 90.
First share = 3 × 90 = ₦270. Second = 5 × 90 = ₦450.

💡 In Nigeria, ratios are used in sharing profits, mixing concrete, and splitting inheritance.

📝 Quiz — Test Your Understanding

Answer all 5 questions, then click Submit to see your result.

Question 1 of 5
What is 15% of 300?
15/100 × 300 = 45.
Question 2 of 5
A shirt costs ₦1,200 and is discounted by 25%. What is the sale price?
25% of 1200 = 300. Sale price = 1200 − 300 = ₦900.
Question 3 of 5
Share 480 in the ratio 3:5.
Total parts = 8. Each part = 60. Shares: 3×60=180 and 5×60=300.
Question 4 of 5
Convert 3/8 to a percentage.
3/8 × 100 = 37.5%.
Question 5 of 5
A population grew from 500 to 600. What is the percentage increase?
Increase = 100. % increase = 100/500 × 100 = 20%.
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