Example 1 · level 1
Find the HCF of 24 and 20.
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- HCF(24, 20) = 4.
Answer: 4
CLASS 5 MATHS · FACTORS AND MULTIPLES
Common factors and common multiples
Highest common factor (HCF): biggest number dividing both. Lowest common multiple (LCM): smallest number both divide.
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Worked examples
Example 2 · level 2
Find the HCF of 30 and 12.
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- HCF(30, 12) = 6.
Answer: 6
Example 3 · level 3
21 laddoos and 18 barfis are to be packed in boxes, each box with the same number and only one kind of sweet. What is the largest possible number of sweets in a box?
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- HCF(21, 18) = 3.
Answer: 3