3 Class 6 Factors, Multiples

Question 1

What are Co-Prime Number

Answer 1

two or more numbers having 1 as common factor are called co-prime

Question 2

Is there a trick to identify co-prime numbers easily?

Answer 2

If both are prime numbers, then they are co-prime.
Two consecutive numbers are always co-prime

Question 3

All factors - except the number itself- of a number is less than or equal to half of the number?

Answer 3

Yes

Question 4

Is there a trick to find all the common multiples without actually writing all of them

Answer 4

Yes. Find first common multiple. Then the multiples of the first common multiple are the multiples.

Question 5

If two or more numbers are prime then they are always co-prime

Answer 5

Yes

Question 6

If a number is divisible by two co-prime numbers, then the number is also divisible by their product?

Answer 6

Yes

Question 7

If two numbers are divisible by a number, then sum of two numbers is also divisble by that number?

Answer 7

Yes

Question 8

If two numbers are divisible by a number, then difference of two numbers is also divisible by that number?

Answer 8

Yes

Question 9

If a number is divisible by 3 it must be divisible by 9?

Answer 9

No

Question 10

If a number is divisible by 9 then it must be divisible by 3

Answer 10

Yes