Q1
What is 25% of 80?
A20
B25
C80
D100
ICSEClass 8 (ICSE)MathematicsCh 7 · Topic 1
Percent and Percentage
Percentages express numbers as parts of 100, useful for comparing proportions, calculating changes, and solving real-world problems.
Core concept
To find a percentage of a number, we multiply the number by the percentage and divide by 100, like 25% of 80 = (25×80)÷100 = 20.
How it works
Percentage increase or decrease is calculated as (change ÷ original value) × 100, showing how much something has grown or shrunk proportionally.
Why it matters
Converting between fractions, decimals, and percentages helps us compare quantities expressed in different formats.
Key detail
Percentages are widely used in finance, statistics, and everyday life for expressing proportions and changes clearly.
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Quick notes
• Percentage of a number: (percentage × number) ÷ 100.
• 25% of 80 = 20.
• Percentage change = (change ÷ original) × 100.
• This shows proportional growth or shrinkage.
• Fractions, decimals and percentages can convert between each other.
• This helps compare different formats.
• Percentages are used in finance and statistics.
• They express proportions clearly in daily life.