✏️ Practice Exercises

LCM & HCF

3 problems · Easy to Hard · Type your working · AI checks your steps

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How to use these exercises

Read the question → work it out step-by-step in the box → click Check My Working to get AI feedback. Use hints if stuck. Reveal the full solution only after you have tried.

01

easy

HCF of 18 and 24:

💡 Show hint

Largest number dividing both.

Your Working

02

medium

LCM of 12, 15, 20:

💡 Show hint

Take max prime powers.

Your Working

03

hard

Three bells ring every 9, 12, 15 minutes. They ring together at 6 AM. Next together?

💡 Show hint

LCM gives the gap.

Your Working

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