Is 385 is a composite number or not ?
- As we already know that, the number having factors 1 and the number itself is the prime number.
- And numbers having more than these two factors are the composite numbers.
- To check whether the number 385 is composite or not first we have to find its factors.
Contents
Factors of 385:
- If we have taken numbers from 1, 2, 3…for checking factors of 385, we found that 385 has factors 1, 5, 7, 11, 35, 55, 77 and 385. Hence, we must say that 385 is a composite number.
- Thus, 385 is the composite number.
- If we multiply 385 by 1, 2, 3 then we get the multiples of 385 which are 385, 770 and so on.
385 is a Composite number or Prime number
About the number 385:
- 385 has more than two factors which are 1, 5, 7, 11, 35, 55, 77 and 385 and hence it is the composite number.
- 385 is the odd composite number and it is not the perfect square also.
- If we divide 385 by 1, 5, 7, 11, 35, 55, 77 and 385 then we get remainder as zero. Hence, 1, 5, 7, 11, 35, 55, 77 and 385 are the factors of 385.
Note:
- 385 is not the perfect square.
- Factors of 385: 1, 5, 7, 11, 35, 55, 77 and 385
- Prime factors of 385: 5, 7, 11
Conclusion:
- 385 is the composite number which has factors 1, 5, 7, 11, 35, 55, 77 and 385.
- And hence, 385 is not the prime number.
Multiple Choice Questions:
1) 385 is a
a) odd number
b) Prime number
c) Composite number
d) Both a and c
Ans: d) both a and c
2) The prime factors of a composite number 385 are
a) 1
b) 5, 7, 11
c) 1, 35, 55, 77 and 385
d) 1, 5, 7, 11, 35, 55, 77 and 385
Ans: b) 5, 7, 11
3) 385 is the odd composite number because
a) It has factors 1, 5, 7, 11, 35, 55, 77 and 385
b) It is divisible by 2
c) It is not divisible by 2
d) Both a and c
Ans: d) both a and c