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JSS 1 Mathematics First Term - HCF and LCM | Edwin Ogie Library

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JSS 1 Mathematics First Term - HCF and LCM | Edwin Ogie Library

JSS 1 Mathematics First Term: HCF and LCM

This is the second topic in JSS 1 first-term Mathematics. Learn the meaning of highest common factor and lowest common multiple, study worked examples, then take the 20-question CBT quiz on the page.

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Topic 2

HCF and LCM

HCF means Highest Common Factor. LCM means Lowest Common Multiple. These help in grouping, sharing, and finding common sizes in Mathematics.

Class

JSS 1

First Term Mathematics lesson content prepared in a clear and student-friendly web book format.

Assessment

CBT Practice

20 multiple-choice questions, 10-minute countdown, auto scoring, answer corrections, and email score prompt.

Lesson Note: HCF and LCM

Highest Common Factor (HCF) is the greatest number that can divide two or more numbers exactly.

Lowest Common Multiple (LCM) is the smallest number that is a multiple of two or more numbers.

HCF is used when we want to share items into equal groups without remainder. LCM is used when we want to find when events repeat together or when items meet at the same time.

Example 1: Find the HCF of 12 and 18.
Show solution

Factors of 12: 1, 2, 3, 4, 6, 12. Factors of 18: 1, 2, 3, 6, 9, 18. The highest common factor is 6.

Example 2: Find the LCM of 4 and 6.
Show solution

Multiples of 4: 4, 8, 12, 16, 20, ... Multiples of 6: 6, 12, 18, 24, ... The lowest common multiple is 12.

Example 3: Find the HCF of 15 and 25.
Show solution

Factors of 15: 1, 3, 5, 15. Factors of 25: 1, 5, 25. The HCF is 5.

Example 4: Find the LCM of 3 and 5.
Show solution

Multiples of 3: 3, 6, 9, 12, 15, ... Multiples of 5: 5, 10, 15, 20, ... The LCM is 15.

Example 5: Find the HCF and LCM of 8 and 12.
Show solution

Factors of 8: 1, 2, 4, 8. Factors of 12: 1, 2, 3, 4, 6, 12. HCF is 4. Multiples show the LCM is 24.

CBT Practice Test

20 questions | 10 minutes | Quiz runs on this page.

10:00
Send Score by Email

Quiz Result

The email button opens a draft to edwinogielibrary@gmail.com so the score can be sent easily after submission.

Revision Tip

To find the HCF, list factors or use prime factorization. To find the LCM, list multiples or use prime factors. Practice both methods until you can answer quickly and correctly.

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