HCF & LCM · built from real SSC papers

HCF & LCM, the Fast Way

Break numbers into primes once, then read both answers off the exponents — lowest powers for HCF, highest for LCM. Master a handful of shortcuts and these become 15-second questions. Pick any topic to start — nothing is locked.

6 topics · every exam question type

🧱1. HCF & LCM BasicsPrime factorisation, finding HCF & LCM, key properties4 types ✖️2. Product, Pairs & MultiplesHCF × LCM = product; counting valid pairs3 types ⚖️3. Numbers from a RatioBuild the numbers from a ratio + HCF or LCM2 types 🔁4. Remainder ProblemsLeast/greatest number with given remainders4 types 📏5. Measurement & TimingTapes, cans, tiles, bells, runners4 types ➗6. Fractions & ReciprocalsHCF/LCM of fractions; sum of reciprocals2 types