LCM & HCF Questions for ADRE Grade IV 2027
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LCM & HCF — Quick Overview
LCM and HCF have direct and word problem forms in ADRE. 2-3 questions expected.
Key Formula
HCF: divide larger by smaller, use remainder | LCM: prime factorization method
Exam Tip
"Largest number that divides both" = HCF. "Smallest number divisible by both" = LCM.
Common Trap
For word problems with "rings every X and Y minutes" — find LCM, not HCF.