LCM – Verified PYQ Authority Guide
LCM is treated here as a focused concept hub. The aim is to show exactly how this concept appears across verified PYQs, which formulas or relationships recur in the solved corpus, and which nearby concepts deserve revision next. Every factual learning cue below is drawn from the existing verified, published and approved English PYQ corpus or from its Knowledge Graph relationships; the hub does not invent unsupported technical claims.
PYQ evidence snapshot
9 verified PYQs are currently mapped to this Concept hub. The represented years include 2025. Exam coverage currently includes RRB NTPC Under Graduate Level. Subject context includes Quantitative Aptitude. These values come from live mappings and can expand automatically when new verified PYQs are added.
Most useful verified PYQs to solve first
Start with the actual questions rather than memorising a generic note. The links below are ranked from the mapped corpus using repeat history and editorial quality, while the complete explanation stays on the individual question page.
- The HCF of two numbers is 8, and their LCM is 240. If the sum of the two numbers is 88, what are the numbers?
RRB NTPC Under Graduate Level · 2025
Use the standard LCM method and simplify; the result matches 40 and 48. - The LCM of the numbers 3, 7.2 and 0.64 is:
RRB NTPC Under Graduate Level · 2025
Use the standard LCM method and simplify; the result matches 144. - The LCM of the numbers 15, 10 and 0.4 is:
RRB NTPC Under Graduate Level · 2025
Use the standard LCM method and simplify; the result matches 30. - The HCF and LCM of two numbers are 27 and 324, respectively. If one number is 81, find the other number.
RRB NTPC Under Graduate Level · 2025
Use the standard LCM method and simplify; the result matches 108. - The HCF and LCM of two positive integers are 36 and 7,560, respectively. If one of the numbers is 540, what is the other number?
RRB NTPC Under Graduate Level · 2025
Use the standard LCM method and simplify; the result matches 504. - The LCM of the numbers 7, 12.4 and 1 is:
RRB NTPC Under Graduate Level · 2025
Use the standard LCM method and simplify; the result matches 434. - The HCF and LCM of two numbers are 15 and 225, respectively. Which of the following pairs can be the numbers?
RRB NTPC Under Graduate Level · 2025
Use the standard LCM method and simplify; the result matches 45 and 75. - The LCM of the numbers 5, 8.3 and 0.19 is:
RRB NTPC Under Graduate Level · 2025
Use the standard LCM method and simplify; the result matches 7885.
Formula & key-relationship bank from verified solutions
For repeating events, next common occurrence = LCM of the intervals
Use these as revision triggers and open the linked PYQ before applying a formula numerically; variable definitions and assumptions belong to the exact solved question.
Core ideas repeatedly reinforced by the solved corpus
- Use the standard LCM method and simplify; the result matches 40 and 48.
- Use the standard LCM method and simplify; the result matches 144.
- Use the standard LCM method and simplify; the result matches 30.
- Use the standard LCM method and simplify; the result matches 108.
- Use the standard LCM method and simplify; the result matches 504.
Exam tips already validated in SRO solutions
- Identify the LCM relationship before calculation and keep units/bases consistent.
Common mistakes to avoid
- Using a shortcut without checking its conditions or using the wrong base/unit.
Topic and concept coverage
Mapped topic labels include Number Properties. The concept trail includes LCM. Use these labels as a revision map: move from the broad area to the narrow concept, solve a verified PYQ, inspect the detailed reasoning, and then attempt another question from the same cluster.
Knowledge Graph navigation
Continue with HCF, LCM and Divisibility, Number Properties, Number System, Quantitative Aptitude. These are canonical SRO entity links based on the Knowledge Graph and shared question mappings, not keyword-stuffed tag pages.
How to revise this authority page efficiently
- Solve before reading: answer a mapped PYQ first.
- Read the exact explanation: verify the correct principle, formula, distractor logic and common mistake on that question page.
- Move one level in the graph: use the closest concept/sub-topic/topic link rather than opening unrelated content.
- Reattempt: solve another verified PYQ from this hub and check whether the same error repeats.
Quality scope: this page is automatically maintained from SRO’s verified mapped corpus. It enriches one canonical authority URL instead of generating multiple near-duplicate pages for keyword variants. Manual authority articles are never overwritten by the automated engine.