Number system, LCM-HCF, simplification
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- In the exam pattern: First Stage Computer Based Test (CBT-I), Mathematics: 30 questions, 30 marks (RRB notice, 13 Aug 2026).
- Next exam day: CBT-II exam (expected): 15 Feb 2027 (Expected — an estimate, not announced).
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Practice this topic
Take a full mock →Q1 · Number system, LCM-HCF, simplification · MEDIUM
Find the least number which, when divided by 12, 15, and 20, leaves a remainder of 5 in each case.
Q2 · Number system, LCM-HCF, simplification · EASY
What is the HCF of 120, 150, and 180?
Q3 · Number system, LCM-HCF, simplification · EASY
Simplify: 25% of 400 + 12.5% of 800
Q4 · Number system, LCM-HCF, simplification · MEDIUM
The unit digit of the number (7^44 + 3^44) is:
Q5 · Number system, LCM-HCF, simplification · EASY
Which of the following numbers is divisible by 9?