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Quantitative aptitude · lesson 20 of 30 · free

Practice: everyday maths — Quantitative aptitude for kids

This practice lesson mixes questions from the whole of Part 2: percentage change, profit and loss, discount, simple and compound interest, averages, ages, speed and work. Pass it to show your everyday maths is test-ready.

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The method

Find the 100% — “decide which value is the 100% (cost price, marked price, principal, start value) before you calculate”

  1. Name the topic and write its formula.
  2. For percent questions, decide which value is the 100%.
  3. Check units (₹, km/h, days) and whether the answer is sensible.

Use it for: Revising Part 2 before a scholarship, Olympiad or school test.

Worked example: A watch bought for ₹800 is sold at a loss of 15%. What is the selling price (in ₹)? → 680

  1. 15% of ₹800 = ₹120.
  2. Selling price = 800 − 120 = ₹680.

Check: 680 ÷ 800 × 100 = 85%, which is 15% less than 100% ✓

▶ Watch it animated

✓ Written and checked by the TalentJR team · Updated 13 Oct 2026 · How we make our lessons

✏️ Practice

Work it out in your head or on paper, then tap your answer — or type it and press Check. Stuck? Press “Show me how”.

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🏁 Lesson 20 test

20 questions. Check each answer, then go to the next one. Get 16 or more right to pass.

🏅 Sign in with Google to earn the 🥈 Everyday Maths Hero badge when you pass — and a certificate when you finish all 10 lessons of Part 2 · Everyday maths. You can still take the test without signing in.

🖨️ Everyday Maths Practice Worksheet

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