Question
The H.C.F. and the L.C.M. of two numbers are 18 and 540, respectively. If one of the numbers is 90, then find the other number.
Asked in RRB Section Controller · 2025
LCM and HCF · Quantitative Aptitude
Exam PYQ4 Options
Quick Revision
Using prime factorization, take every prime factor with its highest power.
Correct AnswerCorrect option for this question
Learn LCM and HCF in 60 Seconds
Watch how LCM can be calculated systematically without listing long sets of multiples.
Everything you need to learn, practice & excel — in one place.
3,000+ Video-Based Study Material
PYQ-Based Quizzes
4,000+ Informative Audiobooks
6,300+ Full-Length Mock Tests
Daily Current Affairs
40,000+ PYQs
Questions Asked from LCM: Prime Factorisation & The Ladder Method in Previous Exams
See how often LCM: Prime Factorisation & The Ladder Method has appeared in previous-year questions across major government exams.
15UPSC Questions Asked in These Years:2010, 2011, 2012, 2013, 2014, 2015, 2016, 2017, 2018, 2019, 2020, 2022, 2023, 2024, 2026
9SSC Questions Asked in These Years:2018, 2019, 2020, 2021, 2022, 2023, 2024, 2025, 2026
7Railways Questions Asked in These Years:2016, 2018, 2021, 2022, 2024, 2025, 2026
16State PSC Questions Asked in These Years:2002, 2004, 2012, 2013, 2014, 2015, 2016, 2017, 2018, 2019, 2020, 2021, 2022, 2023, 2024, 2025
LCM: Prime Factorisation & The Ladder Method has appeared in 47 previous-year exam questions, most frequently in State PSC, UPSC and SSC.
2-Minute Revision Notes
Revise LCM and HCF and Its Related Concepts
Strengthen key concepts with exam-focused visual notes for faster revision.
Explore More Questions
Continue practising by chapter, topic and related subjects.
One question solved. Keep going.
Continue with the next Number System question and build your accuracy one question at a time.