Composite Numbers

Number Theory Level 1

Out of the first 10 positive integers, how many of them are composite?


The answer is 5.

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Arron Kau by Arron Kau

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7 solutions

Barjuan Davis
Nov 12, 2013

First 10 positive integers are 1,2,3,4,5,6,7,8,9, and 10.

remember, composite numbers are numbers that NOT A PRIME NUMBER.

So, you can take out 1,2,3,5, and 7. The rest are the answer.

1 Helpful 0 Interesting 0 Brilliant 0 Confused

Can you write what you mean? You are currently saying that 1 is a prime.

Calvin Lin Staff - 7 years, 7 months ago

I don't understand, why don't we put 10 as the answer too?

Edward Jeremy Lo - 7 years, 7 months ago

But 1 is not a prime number

lawal Adeshina - 7 years, 7 months ago

BUT IS 1 ALSO A PRIME NUMBER ?

Devesh Rai - 7 years, 6 months ago

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1 is prime!!!!!!!!!!! From where do you hear it????

shithil Islam - 5 years, 4 months ago
Mohammad Fiyaz
Feb 13, 2014

all the positive integers are composite numbers except all prime numbers and 1.

so first 10 positive integers are following:

1, 2, 3, 4, 5, 6, 7, 8, 9, 10

only 4, 6, 8, 9 and 10 are composite rest are prime numbers and 1 is unit.

thus, 5 is answer.

0 Helpful 0 Interesting 0 Brilliant 0 Confused
Nita Wijaya
Dec 9, 2013

The first 10 composite number are 4,6,8,9,10 [5] Composite number is a number that can be factorized 4 = 2^2 6 = 2 3 8 = 2^3 9 = 3^2 10 = 2 5

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Composite Number is a whole number that can be divided evenly by numbers other than 1 or itself. Example: 9 can be divided evenly by 3 (as well as 1 and 9), so 9 is a composite number. 7 can only be divided evenly by 1 or 7, so it is NOT. 4, 6, 8, 9, 10 are COMPOSITE.

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Shubham Namdeo
Nov 16, 2013

1,2,3,4,5,6,7,8,9,10 compite number is amumber which has factors other than 1 or the number itself. hence, the numbers are 4,6,8,9,10

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John Patrick Bas
Nov 13, 2013

the first 10 positive integers are 1, 2, 3, 4, 5, 6, 7, 8, 9, and 10. Only 4, 6 8, 9, and 10 are composite. then the answer is 5.

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Ahmed Alaa
Nov 11, 2013

4 , 6 , 8 , 9 , 10

0 Helpful 0 Interesting 0 Brilliant 0 Confused

1 is neither a prime nor a composite.

SAMARTH M.O. - 7 years, 6 months ago

1-4-6-8-9-10

lawal Adeshina - 7 years, 7 months ago

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