List of top Mathematics Questions on Some Problems on HCF and LCM asked in CBSE Class VI

HCF of co-prime numbers 4 and 15 was found as follows by factorisation : 4 = 2 × 2 and 15 = 3 × 5 since there is no common prime factor, so HCF of 4 and 15 is 0. Is the answer correct? If not, what is the correct HCF?

What is the HCF of two consecutive
1. numbers?
2. even numbers?
3. odd numbers?

Find the LCM of the following numbers in which one number is the factor of the other
1. 5, 20
2. 6, 18
3. 12, 48
4. 9, 45
What do you observe in the results obtained?

Find the LCM of the following numbers :
1. 9 and 4
2. 12 and 5
3. 6 and 5
4. 15 and 4
Observe a common property in the obtained LCMs. Is LCM the product of two numbers in each case?