🧠🔢 HCF–LCM Traps That Fail CSAT Aspirants Every Year! | UPSC

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HCF–LCM may look easy on the surface, but this chapter is one of the biggest trap zones in UPSC CSAT. In this session, Gaurav Sir breaks the myth that Number System questions are straightforward and shows why many aspirants lose marks despite knowing the basics.

This video simplifies HCF–LCM using three powerful models that cover almost every CSAT pattern—from questions with the same remainder, to those with different remainders but equal differences, and finally the tricky cases where hit-and-trial becomes the smartest approach. Instead of memorising formulas, you’ll learn how to identify the model first, so you instantly know whether to apply LCM logic or shift strategies.

The session also dives into real CSAT-style applications, including largest and smallest number problems, bell ringing questions, and high-frequency fraction-based HCF–LCM concepts—where numerator LCM and denominator HCF play a crucial role. These ideas don’t just stay limited to Number System; they directly extend to Time & Work, Time & Distance, and Ratio questions as well.

What makes this video special is the focus on exam thinking—how UPSC frames traps, how to read remainders smartly, and how to save time during calculations using shortcuts instead of long prime factorisation. If CSAT speed and accuracy are your concern, this video gives you the structure, clarity, and confidence you need.

Watch till the end, attempt the homework question shared, and drop your answer in the comments to test your understanding. 📊✍️
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