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Course Guides8 min read
Course Guides
7 min read
How to Calculate Percentages: Complete Formula + Examples
Published: 14.05.2026·Updated: 02.06.2026
Rina Kusuma
Senior Coding Instructor
What Is a Percentage?
A percentage expresses a part as a fraction of a whole, where the whole is always treated as 100. The word "percent" comes from the Latin per centum, meaning "per hundred".
Basic formula:
Simple example: if you answer 80 out of 100 questions correctly, your score is 80%.
Percentages appear everywhere — from school report cards and shopping discounts to 11% VAT, savings interest, and statistics. Understanding percentages is the most practical maths skill for everyday life.
Frequently Asked Questions
Does Algonova teach mathematics?
Yes! Algonova has maths programmes for children aged 7–17, from primary school basics through to university entrance preparation. All classes are online with certified tutors in groups of up to 8.
Is there a free trial maths class?
Yes! The trial class is 60 minutes, completely free, and requires no credit card. The tutor will assess your child’s level and recommend the best programme.
How many students are in one maths class?
A maximum of 8 students per class. Small groups ensure every child receives personal attention and the teacher can step in immediately when a student is struggling.
How much does maths tutoring at Algonova cost?
Start with the free trial class — no fees, no commitment. After the trial, our team will explain the package options that best fit your child’s needs.
What is a percentage in maths?
A percentage expresses a part as a fraction of a whole, where the whole equals 100. Formula: Percentage = (Part ÷ Total) × 100.
How do you calculate a percentage discount?
Final price = Original price × (1 − Discount% ÷ 100). Example: Rp 100,000 with 20% discount → Rp 100,000 × 0.80 = Rp 80,000.
What’s the quickest way to calculate a percentage mentally?
Use these tricks: 10% = divide by 10, 5% = divide by 20, 25% = divide by 4, 50% = divide by 2. Combine them: 15% = 10% + 5%, 30% = 10% × 3.
