Hello,

Here are the key formulas related to LCM (Least Common Multiple) and HCF (Highest Common Factor):

1. Relationship between LCM and HCF :

LCM×HCF=a×b

where a and b are two given numbers.

2. Formula for LCM and HCF :

LCM=a×b/HCF

and

HCF=a×b/LCM

Explanation:

• The first formula shows the product of the LCM and HCF of two numbers equals the product of the numbers themselves.
• The second formula can be used to find either the LCM or HCF given the other is known along with, and.
• These are used to solve problems related to LCM and HCF in Class 10 mathematics.