Interaktiv sahifaGrade 5Mathematics
Prime and Composite Numbers
Grade 5 maths: prime and composite numbers, factors and why 1 is special.
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A Grade 5 Mathematics topic: «Prime and Composite Numbers» (Chapter 1 · A, pp. 11–15).
A number that divides another without a remainder is its factor. A prime number has exactly two factors: 1 and itself (2, 3, 5, 7). A composite number has more than two factors (4, 6, 8, 9). The number 1 is neither prime nor composite — it has only one factor. From 1 to 100 there are 25 prime and 74 composite numbers.
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- 21-sentabr, 2026