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Playing With Numbers CBSE Class 6

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Playing With Numbers Topics

Full fledge assessment Videos

Video Based Test funda (Please watch the above videos before attempting this assessment)
Question 1/20

Q 1. LCM × HCF = ? 

Solution

LCM × HCF = Product of two numbers 

Q 2. Prime numbers are the ones which have 

Solution

Prime numbers are the ones which have only two factors. 

Q 3. The factors of 25 are 

Solution

The factors of 25 are 1, 5 and 25. 

Q 4. The prime factors of 19 are 

Solution

The prime factors of 19 are 1 and 19. 

Q 5. Which of the following is the LCM of 50, 90? 

Solution

  

Q 6. The prime factors of 29 are 

Solution

The prime factors of 29 are 1 and 29. 

Q 7. What is the LCM of 8 and 36? 

Solution

8 = 2 × 2 × 2

36 = 2 × 2 × 3 × 3

LCM (8, 36) = 2 × 2 × 2 × 3 × 3 = 72 

Q 8. Numbers ‘a’ and ‘b’ have only one common factor. Hence, 

Solution

Co-prime numbers have only one common factor. 

Q 9. Which of the following pairs are co-prime? 

Solution

16 = 2 × 2 × 2 × 2 × 1

25 = 5 × 5 × 1

16 and 25 have only one common factor. 

Q 10. All _____ are divisible by 2. 

Solution

All even numbers are divisible by 2. 

Q 11. Which of the following numbers is divisible by 3? 

Solution

1 + 0 + 2 = 3 is divisible by 3; so by the divisibility test of 3, 102 is divisible by 3. 

Q 12. Express 20 as the product of its prime factors. 

Solution

20 = 2 × 2 × 5 

Q 13. What is the HCF of 7, 14 and 24? 

Solution

  

Q 14. Two wires are 12 m and 16 m long. The wires are to be cut into pieces of equal length. Find the maximum length of each piece. 

Solution

12 = 2 × 2 × 3

16 = 2 × 2 × 2 × 2

HCF (12, 16) = 2 × 2 = 4

The maximum length of each piece is 4 m. 

Q 15. Find the prime factorisation of 36 by using the division method. 

Solution

36 = 2 × 2 × 3 × 3 

Q 16. What is the HCF of 12 and 16? 

Solution

  

Q 17. The factors of 35 are 

Solution

The factors of 14 are 1, 5, 7, 35. 

Q 18. Find the prime factorisation of 75 by using the division method. 

Solution

  

75 = 3 × 5 × 5 

Q 19. What is the HCF of 12, 36, 48? 

Solution

12 = 2 × 2 × 3

36 = 2 × 2 × 3 × 3

48 = 2 × 2 × 2 × 2 × 3

HCF (12, 36, 48) = 12 

Q 20. What is HCF? 

Solution

HCF is the product of only common factors. 

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Asked by deshwalnitu6 1st December 2019, 12:14 PM
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