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Mathematics · Number and Algebra · Chapter 2
Real Numbers
Taught in Class 9O Level
Topics in this chapter
- 2.1Natural Numbers, Integers, Rational and Irrational NumbersThe family of numbers: natural, whole, integers, rational and irrational numbers, and changing recurring decimals to fractions.
- 2.2The Real Number LineEvery real number on the number line: ordering, locating √2, inequalities with open and filled dots, and absolute value.
- 2.3Properties of Real NumbersClosure, commutative, associative, distributive, identity and inverse properties, and the properties of equality and order.
- 2.4Surds and Rationalising the DenominatorSimplifying, adding and multiplying surds, and rationalising denominators with the conjugate.
- 2.5Laws of IndicesProduct, quotient and power laws, zero, negative and fractional indices, with worked examples.
- 2.6Standard Form (Scientific Notation)Writing very large and very small numbers as A × 10ⁿ, and calculating with them.
- 2.7Rounding, Approximation and Significant FiguresRounding to decimal places and significant figures, estimating answers, and upper and lower bounds.
Linked chapters in other subjects
Ideas in this chapter connect to these chapters. Open one to see the link.