Interaktiv sahifaGrade 8Mathematics
Sets of Numbers
Grade 8 maths: natural numbers, integers, rational and irrational numbers.
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A Grade 8 Mathematics topic: «Sets of Numbers» (Chapter 1 «Numbers», 1.1, pp. 7–11, Toh Tin Lam).
The aim of the lesson is to classify numbers. 1, 2, 3, 4, 5, … are natural numbers. The integers include the natural numbers, 0 and the negative numbers. Numbers written in the form a/b are called rational (3 = 3/1, and 0.7 = 7/10 is rational too). Numbers that cannot be written as a/b are irrational; the best known is π = 3.1415926…, while 22/7 is an approximate value of it. The sets sit inside one another: natural ⊂ integer ⊂ rational.
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- 21-sentabr, 2026