Common Factors

Q.

Question 1 (d)

Find the common factors of:
56 and 120

Q. Find the common factors of 6 and 8.

1. 1 and 2
2. 1 and 3
3. 2 and 3
4. 3 and 4

Q.

Question 2 (b)

Find the common factors of:
5, 15 and 25

Q.

Question 34
The number of common prime factors of 75, 60, 105 is

(A) 2
(B) 3
(C) 4
(D) 5

Q.

Find the first three common multiples of $6,8$

Q.

The common factors of 75, 60 and 210 are:

1. 1, 3, 5, 15

2. 1, 3, 5, 15, 25

3. 1, 3, 15, 25

4. 3, 5, 15

Q.

Find the common factors of $56$ and $120$ ?

Q.

A number is divisible by $5$and $8$ both. By what other numbers will that number be always divisible?

Q.

Write all the numbers less than 90 which are common multiples of $5$ and $6$.

Q. Find the common factors of $20$ and $28$.

Q. a and b are two positive integer such that the least prime factor of a is 3 and the least prime factor of b is 5. Then calculate the least prime factor of (a+b).

Q.

Find the H.C.F of the following numbers:$12,45,75$

Q. $2^{x-7}\times 5^{x-4}=1250$ find $x$

Q.

Using prime factorization method, find the HCF of $3,192$ and $14,280$

Q. Find the common factors of 10 and 15.

1. 1 and 5
2. 1 and 2
3. 3 and 5
4. 2 and 5

Q.

Choose The Most Appropriate Answer I Love Reading This Novel I ----------------- It Four Or Five Times Already

1. read

2. am reading

3. have read

4. had read

Q.

Find the common factors of $21$ and $35$.

Q.

Find the first three common multiples of: $2,3,$and $4$.

Q.

Find the common factors of $3,6$ and $9$.

Q.

Write the numbers between $100$ and $200$ which are common multiples of $4$ and $8$ .

Q.

Write all the common multiples of $7$ and $5$ from $1$ to $100$.

Q.

Find the LCM by the method of division.

$9,15,16,35,36$

Q.

Find the HCF of the following numbers using prime factorisation method.

$72,108,180$

Q.

Find the first five common multiples of :

$12$ and $16$

Q. State whether the following statements are true or false in the respective order.
Statement 1: If two numbers are co-primes, at least one of them must be prime.
Statement 2: If a number exactly divides two numbers, then it must also divide the sum of both numbers.
Statement 3: If a number exactly divides the sum of two numbers, it must exactly divide the two numbers separately.

1. True, True, False
2. False, True, False
3. False, True, True
4. True, True, True

Q.

Find the HCF of $96$ and $404$

Q.

Which of the following is a pair of co-primes?

1. $\left(14,35\right)$

2. $\left(18,25\right)$

3. $\left(31,93\right)$

4. $\left(32,62\right)$

Q.

The H.C.F of $25$and $135$ is

1. $3$

2. $5$

3. $9$

4. none of these

Q.

Find the HCF using prime factorisation method .

$5500$ and $7700$

Q. Find the common factors of :
a) $4,8$ and $12$
b) $5,15$ and $25$