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Secondary
Algebra
Pre-Algebra
Factors and multiples

Damian Kerr

Answered question

2022-02-03

What is the composite number between 20 and 40?

Answer & Explanation

iloverayyeb Beginner2022-02-04Added 14 answers

A composite number is any number which has factors apart from 1 and itself.So most numbers between 20 and 40 are composite:

20 = 2 \times 2 \times 5

21 = 3 \times 7

22 = 2 \times 11

24 = 2 \times 2 \times 2 \times 3

25 = 5 \times 5

26 = 2 \times 13

27 = 3 \times 3 \times 3

28 = 2 \times 2 \times 7

30 = 2 \times 3 \times 5

32 = 2 \times 2 \times 2 \times 2 \times 2

33 = 3 \times 11

34 = 2 \times 17

35 = 5 \times 7

36 = 2 \times 2 \times 3 \times 3

38 = 2 \times 19

39 = 3 \times 13

40 = 2 \times 2 \times 2 \times 5

The only ' numbers (having no factors apart from 1 and themselves) between 20 and 40 are: 23, 29, 31, 37.

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