Free Study Notes for Class 9, 10, 11, 12 & University

Zero! The ancient Romans had no symbol for 0. The idea of zero as a number was born in India and travelled to the world through Arab mathematicians.

12,345,678,987,654,321! The answer climbs 1-2-3-4-5-6-7-8-9 and comes back down. Try checking it on a calculator — maths has hidden patterns everywhere.

More than 100 trillion digits! π is an irrational number — its digits never end and never repeat. That is exactly what you study in Chapter 1: Real Numbers.

300,000 km in ONE second! Light is so fast it could travel around the whole Earth about 7.5 times before you finish blinking twice. Nothing in the universe is faster.

Because water EXPANDS when it freezes! Almost everything shrinks when it gets cold, but water spreads out — so ice becomes lighter than water and floats. That is why fish survive winter under frozen lakes.

Ada Lovelace — in the 1840s! She wrote the first computer program for a machine that had not even been built yet. She saw the future of computers 100 years before they arrived.