Prime/composite numbers, divisibility, LCM and HCF/GCM.
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Q1 · Prime, Composite, LCM and GCM · EASY
A teacher asks students to find all the prime numbers between 30 and 50. Which of the following lists contains only prime numbers?
Q2 · Prime, Composite, LCM and GCM · MEDIUM
The HCF of two numbers is 18 and their LCM is 360. If one of the numbers is 72, what is the other number?
Q3 · Prime, Composite, LCM and GCM · MEDIUM
Three bells ring at intervals of 12 minutes, 18 minutes and 24 minutes respectively. If they all ring together at 9:00 AM, at what time will they next ring together?
Q4 · Prime, Composite, LCM and GCM · HARD
A number when divided by 12, 15 and 20 leaves a remainder of 7 in each case. What is the smallest such three-digit number?
Q5 · Prime, Composite, LCM and GCM · MEDIUM
The LCM of 12 and 18 is: