Class #
Class #
CBSE
UP Board
📘 What's inside:
1. Introduction
HCF (Highest Common Factor) is the largest number that divides given numbers exactly.
2. Key Formula
The relationship between HCF and LCM is given by:
\[ \text{HCF}(a,b) \times \text{LCM}(a,b) = a \times b \]» Solved Example 1
Example 1
Meena has 8 pencils. She arranges them in pairs. Does she have an even number of pencils?- 1 Arrange 8 pencils into pairs: (2), (2), (2), (2). That is 4 complete pairs.
- 2 No pencil is left over. Every pencil has a partner.
- 3 Also check the ones digit: 8 ends in 8. 8 is in the list 0, 2, 4, 6, 8. So 8 is even.
Yes, 8 is an even number. Meena can arrange all pencils in perfect pairs.
📄 Free Worksheet
Practise identifying even and odd numbers, sorting them and applying the ones digit rule with our free printable worksheet. No login required.
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