Number System Questions for ADRE Grade III 2027
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Number System — Quick Overview
Tests divisibility rules, LCM/HCF, remainders. 3-5 questions typical in ADRE.
Key Formula
HCF × LCM = Product of two numbers | Divisibility by 9: sum of digits divisible by 9
Exam Tip
Learn divisibility rules for 2,3,4,5,6,7,8,9,11 — cuts calculation time by 70%.
Common Trap
LCM is always ≥ HCF. If two numbers are co-prime, their HCF=1 and LCM=their product.