Prime/composite numbers, HCF and LCM.
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Q1 · Factors and Multiples · EASY
A teacher asks students to find all the factors of 36. One student lists: 1, 2, 3, 4, 6, 9, 12, 18, 36. Is this list correct?
Q2 · Factors and Multiples · MEDIUM
In a school, 48 boys and 60 girls are to be divided into groups such that each group has the same number of boys and the same number of girls. What is the maximum number of such groups that can be formed?
Q3 · Factors and Multiples · MEDIUM
A number has exactly three prime factors: 2, 3, and 5. If the number is less than 100 and is divisible by 30, which of the following could be the number?
Q4 · Factors and Multiples · HARD
Three bells ring at intervals of 12 minutes, 18 minutes, and 20 minutes respectively. If they all ring together at 9:00 AM, at what time will they next ring together?
Q5 · Factors and Multiples · HARD
What is the Highest Common Factor (HCF) of 48 and 72?