Class 6 Mathematics Practice Sheet: CBSE Class 6 Mathematics Revision Worksheet Set 01
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CBSE Class 4 Maths Revision Worksheet (165) - Time
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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
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All Chapters Printable Worksheets and Exercises for Class 6 Mathematics
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