← Back to Class 5🔒
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Class 5 · Topic 3
Factors, Multiples, HCF & LCM
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Step 1 · Learn
Read the ideas
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Factors
Factors of 12: 1, 2, 3, 4, 6, 12.
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Multiples
Multiples of 4: 4, 8, 12, 16, … (forever).
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Prime Factorisation
72 = 2 × 2 × 2 × 3 × 3 = 2³ × 3².
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HCF
hcf of 12 and 18 = 6. Use it for equal-share problems.
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LCM
lcm of 4 and 6 = 12. hcf × lcm = a × b.
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HCF & LCM Word Problems
Look for the signal-word, then pick your tool.
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Step 2 · Practice
Try the quests
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Step 3 · Boss Battle
Beat the boss
🛡️ 🛡️ 🛡️ 3 shields — lose all → 60-second cooldown
Round 1
The forge door carries four number plates.…
🔒Round 2
A conveyor belt is numbered 1 to 60. A gem…
🔒Round 3
The forge key is stamped with a prime…
🔒Round 4
Three iron rods are 90 cm, 120 cm and 150…
🔒Round 5
Three hammers strike every 16, 24 and 40…
🔒Round 6
A florist has 24 roses, 36 lilies and 60…
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