CBSE Class 6 Mathematics Revision Worksheet Set A

CBSE Class 4 Maths Revision Worksheet (165) - Time

Worksheets have become an integral part of the education system. Worksheets are very critical for every student to practice his/ her concepts. Students, teachers and parents can download all CBSE educational material and extremely well prepared worksheets from this website. All revision worksheets, Sample papers, Question banks and easy to learn study notes for all classes and subjects have been prepared based on the latest guidelines sent by CBSE. All CBSE educational material is developed by our panel of teachers, have also been submitted by thousands of teachers and students. The study material has been carefully compiled by the best teachers in India. Worksheets have been submitted by teachers of various CBSE schools and also have been carefully developed keeping into consideration the latest CBSE syllabus.

Prime factorisation

Prime factor A factor of a given number is called a prime factor is a prime number.Example 2 and 3 are prime factors of 12

Prime Factorization
"Prime Factorization" is finding which prime numbers multiply together to make the original number.

Example 1: What are the prime factors of 12

Solution
We have:

∴ 12 = 2 × 2 × 3
= 2² × 3
The prime factorization of 12 = 2² × 3
Note: 12 = 2 × 2 × 3 can also be written using exponents as 12 = 2² × 3

1. Give the prime factorisation of each of the following numbers:

1. 18
Solve. 18
We have:

∴ 18 = 2 × 3 × 3
= 2 × 32 The prime factorization of 18 = 2 × 3²

2. 48
Solve. 48
We have:

∴ 48 = 2 × 2 × 2 × 2 ×3
= 2⁴ × 3
The prime factorization of 48 = 2⁴ × 3

3. 56
Solve. 56
We have:

∴ 56 = 2 × 2 × 2 × 7
= 2³ × 7
The prime factorization of 56 = 2³ × 7

4. 90
Solve. 90
We have:

∴ 90 = 2 × 3 × 3 × 5
= 2 × 3² × 5
The prime factorization of 90 = 2 × 3² × 5

5. 136
Solve. 136
We have:

∴ 136 = 2 × 2 × 2 × 17
= 2³ × 17
The prime factorization of 136 = 2³ × 17

6. 252
Solve. 252
We have:

∴ 252 = 2 × 2 × 3 × 3 × 7
= 2² × 3² × 7
The prime factorization of 252 = 2² × 3² × 7

7. 420
Solve. 420
We have:

∴ 420 = 2 × 2 × 3 × 7 × 5
The prime factorization of 420 = 2² × 3 × 5 × 7

8. 637
Solve. 637
We have:

∴ 637 = 7 × 7 × 13 = 7² × 13
The prime factorization of 637 = 7² × 13

9. 945
Solve. 945
We have:

∴ 945 = 3 × 3 × 3 × 5 × 7
= 3³ × 5 × 7
The prime factorization of 945 = 3³ × 5 × 7

1. Which of the following numbers is divisible by 3?
(a) 24357806 (b) 35769812 (c) 83479560 (d) 3336433

2. Which of the following number is divisible by 9?
(a) 8576901 (b) 96345210 (c) 67594310 (d) None

3. Which of the following number is divisible by 4?
(a) 78653234 (b) 98765042 (c) 24689602 (d) 87941032

4. Which of the following number is divisible by 8?
(a) 96354142 (b) 37450176 (c) 57064214 (d) None

5. Which of the following number is divisible by 6?
(a) 8790432 (b) 98671402 (c) 85492014 (d) None

6. Which of the following number is divisible by 11?
(a) 3333333 (b) 1111111 (c) 22222222 (d) None

7. Which of the following number is a prime number ?
(a) 81 (b) 82 (c) 91 (d) 97

8. Which of the following number is a prime number ?
(a) 117 (b) 171 (c) 179 (d) None

9. Which of the following number is a prime number ?
(a) 323 (b) 361 (c) 263 (d) None

10. Which of the following number is a co-prime?
(a) 8, 12 (b) 9, 10 (c) 6, 8 (d) 15, 18

Please click the below link to access CBSE Class 4 Maths Revision Worksheet (165) - Time