Factor multiplies LCM HCF LESSON

Factors • Multiples • LCM • HCF — Interactive Lesson

Simple, hands-on activities for young learners — no storage needed.

Quick Words

Use simple ideas: factors divide the number exactly. Multiples are what you get when you keep adding the number to itself. HCF (highest common factor) = biggest factor two numbers share. LCM (least common multiple) = smallest number that both numbers divide into.

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Factor Finder

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Multiples List

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HCF & LCM Calculator

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How LCM & HCF connect (Simple)

For two numbers a and b:

Formula: HCF(a,b) × LCM(a,b) = a × b (useful to check your answers)

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Prime Factors Method (visual)

We can break numbers into prime factors (2,3,5,7...) then use highest powers for LCM and shared powers for HCF.

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Practice Quiz — Find HCF or LCM

12 and 18

HCF LCM

Tips for Teachers / Parents

• Use objects (coins, pebbles) to show factors and multiples visually.
• For HCF: split both numbers into groups and find the biggest equal group.
• For LCM: list multiples until you find the first match — turn it into a race game!
• Keep numbers small for beginners (≤30).

Mini-game: Find Common Multiples

Click numbers that are multiples of both chosen numbers.

Try-by-Eye (useful for young learners)

Ask: Does the number end with an even digit? / Is sum of digits divisible by 3? These quick checks help spot some factors fast (2,3,5).

Built for easy classroom use — plain HTML/CSS/JS, works offline. Modify numbers and play!