Question

1) 80 has _____ factors
2) smallest odd composit number
3)write hcf of 20 25 and 60 in method

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Answer 1

Answer:

2 questions answere

15 is a smallest odd composit number

Answer 2

Answer:10, 9, 5

Step-by-step explanation:

1) 1 x 80

  2 x 40

  4 x 20

  5 x 16

  8 x 10

 Factors of 18 are 1,2,4,5,8,10,16,20,40 and 80.

So 80 has 10 factors.

2) Composite number means that has more than two factors

So if we go from 1 and see the consecutive odd numbers

1 - Neither (Factors: 1)

3 - Prime number (Factors: 1,3)

5 - Prime number(Factors: 1,5)

7 - Prime number (Factors: 1,7)

9- Composite number (it has  factors (1,3,9))

So smallest odd composite number is 9.

3) To see HCF first you have to write it as a product of its prime numbers.

20 = 2 x 2 x 5

25 = 5 x 5

60 = 2 x 2 x 3 x 5

Now you have to see how many twos threes and fives are common with all three numbers.

Only one 5 is common

So, H.C.F = 5

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