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The World of Numbers Class 9

CBSE

From natural numbers to real numbers: rational and irrational numbers, their decimal forms and the number line.

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Topic-wise short notes with solved examples.Open PDFDownload
Every formula and result of the chapter on one sheet.Open PDFDownload
Daily practice problems with an answer key.Open PDFDownload

What this chapter covers

  • How the number system grew
  • Brahmagupta's rules for zero and integers
  • Rational numbers
  • Rational numbers on the number line
  • Irrational numbers
  • Marking the square root of 2 on the number line
  • Decimal expansions
  • Converting decimals to fractions

The short notes explain each of these topics with solved examples, the formula bank lists every result on one sheet, and the DPP sheet gives practice questions with an answer key.

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