Pure Arithmetic – Grade 9 ICSE

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Rational & Irrational Numbers
Key topics include
• Rational, irrational numbers as real numbers, their place in the number system. Surds and rationalization of surds
• Irrational numbers as non-repeating, non-terminating decimals
• Classical definition of a rational number p/q, p, q ε Z, q≠ 0. Hence, define irrational numbers as what cannot be expressed as above
• Simplifying an expression by rationalizing the denominator
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