(Ch 6: Multiples and Factors)
1. Answer the following questions.
a. Which is the greatest 3-digit multiple of 4?
b. By which smallest digit the ones digit of the number 1,35,798 be replaced so that the number would be
divisible by 9?
c. A number having only two factors is called a prime number. What are the two factors of a prime number?
d. 27 is a multiple of 3. If you reverse 27, you get 72 which is also a multiple of 3. Find any other such numbers.
2. State whether true or false.
a. 1 is a factor of every number. c. 4, 8, 12, 16 are all multiples of 4.
b. 0 is a factor of 6. d. Since 9 4 = 36, 36 is a multiple of both 9 and 4.
1. Find the first 5 multiples of the following numbers.
a. 3 = ___________ c. 10 = ___________ e. 18 = ___________
b. 14 = _________ d. 24 = ___________ f. 21 = ___________
2. Check whether 36 is a multiple of 9.
3. State True or False.
a. 12 is a multiple of 2 __________ c. 35 is a multiple of 7 __________
b. 83 is a multiple of 4 __________ d. 100 is a multiple of 10 __________
4. Find out the first three common multiples of the following.
a. 2 and 4 =___________ c. 5 and 10 =___________
b. 3 and 6 =___________ d. 4 and 8 =__________
5. Find out the first four even multiples of the following.
a. 8 =____________ c. 7 =_____________
b. 13 =__________ d. 15 =___________
6. Find out the first four odd multiples of the following.
a. 9 =____________ c. 17 =___________
b. 11 =___________ d. 23 =___________
7. Find the LCM of the following numbers.
a. 5 and 10 =___________________ c. 14 and 42 =__________________
b. 7 and 21 =___________________ d. 15 and 35 =__________________
1. State whether the following numbers are prime or composite.
a. 2 _____________ d. 13 _____________
b. 5 _____________ e. 16 _____________
c. 9 _____________
2. Fill in the blanks.
a. _________ is the smallest prime number.
b. 37 is a _________ number.
c. A number that has more than two factors is called a _________ number.
d. 3 has only two factors, 1 and 3. So, it is a __________ number.
3. Find the prime factorisation of the following numbers using factor tree method.
a. 22 b. 36 c. 48 d. 51 e. 100 f. 121
1.Find the HCF of the following numbers.
a.13 and 52 b.24 and 46 c.15 and 55 d.23 and 69 e.100 and 1000
2.Find the HCF and LCM of the following numbers and then verify the relationship between them.
a.8 and 64 b.12 and 108 c.13 and 78 d.25 and 50 e.44 and 88
3.Answer the following questions.
a.Find all the prime numbers between 1 and 50.
b.Find all the composite numbers between 40 and 80.
1. Which of the following numbers are divisible by 2?
a. 38 b. 23 c. 67 d. 94 e. 15
2. Write down any 5 numbers that can be divisible by 9.
3. Which of the following numbers are divisible by 6?
a. 86 b. 36 c. 41 d. 60 e. 54
4. State True or False.
a. 91 is divisible by 3. d. 156 is divisible by 4.
b. 83 is divisible by 2. e. 28 is divisible by 5.
c. 100 is divisible by 10.
