Class 9 Maths · Chapter 3 · CBSE / NCERT
The World of Numbers
How the number system grew, from counting numbers to real numbers. You’ll learn integers, rational and irrational numbers, absolute value, π, and decimals that stop, repeat or never repeat.
10 short lessons · about 40 minutes in all
What you’ll learn
- 1Zero is a number you can work with3 min
- 2Debts and fortunes on the number line4 min
- 3Marking fractions on the number line4 min
- 4How far from zero? Absolute value3 min
- 5Always another fraction in between4 min
- 6A length that is not a fraction5 min
- 7Drawing root lengths with a compass4 min
- 8Pi: the same ratio for every circle4 min
- 9Decimals that stop or repeat5 min
- 10Decimals that never end and never repeat4 min
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Zero is a number you can work with · about 3 minutes
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More Class 9 Maths
The other 13 chapters.
CH 1Orienting Yourself: The Use of Coordinates8 lessonsCH 2Introduction to Linear Polynomials9 lessonsCH 4Exploring Algebraic Identities9 lessonsCH 5I’m Up and Down, and Round and Round10 lessonsCH 6Measuring Space: Perimeter and Area10 lessonsCH 7The Mathematics of Maybe: Introduction to Probability9 lessonsCH 8Predicting What Comes Next: Exploring Sequences and Progressions9 lessonsCH 9Propositions and their Converses12 lessonsCH 10How Quantities Combine: Understanding Data10 lessonsCH 11The World of Algorithms10 lessonsCH 12Quadrilaterals11 lessonsCH 13Two Variables, One Line12 lessonsCH 14Math of Space: Surface Area and Volume10 lessons
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