Time: 1 hour
M.M. 30
Attempt all questions.
Q1: Which of the following is a prime number? (1 Mark)
(a) 9
(b) 11
(c) 15
(d) 21
Q2: The least common multiple (LCM) of 4 and 6 is: (1 Mark)
(a) 8
(b) 10
(c) 12
(d) 14
Ans: (c) 12
Q3: Which of the following is NOT a factor of 30? (1 Mark)
(a) 2
(b) 3
(c) 5
(d) 7
Ans: (d) 7
Q4: Which of the following numbers is both a factor and a multiple of 9? (1 Mark)
(a) 1
(b) 3
(c) 9
(d) 18
Ans: (c) 9
Q5: A number that has exactly two factors is called a: (1 Mark)
(a) Prime number
(b) Composite number
(c) Even number
(d) Odd number
Ans: (a) Prime number
Q6: True or False (2 Marks)
(i) 36 is a multiple of 9.
(ii) 6 is the least non-zero multiple of 6.
Ans: True
(iii) 1 is the multiple of 5.
Ans: True
Q7: Fill in the Blanks (2 Marks)
(i) The first six multiples of 4 are ____, ____, ____, ____, ____, and ____.
(ii) A number divisible by both 3 and 5 is a multiple of ____.
(iii) The number 17 is ____ because it has only two factors.
(iv) The smallest whole number is ____.
(v) The common factors of 12 and 18 are ____, ____, and ____.
Q8: Find the common multiples of 3 and 5. (2 Marks)
Q9: Identify the common factors of 20 and 35.? (3 Marks)
Q10: Find out all the factors of 24. (3 Marks)
Q11: Find all the factors of 36 using the division method. (3 Marks)
Q12: There are 24 boys and 36 girls in a class. The teacher wants to divide them into groups so that each group has the same number of boys and the same number of girls. What is the greatest number of groups that can be made? (5 Marks)
Q13: A bell rings every 20 minutes and another bell rings every 30 minutes. If they both ring together at 9:00 a.m., at what time will they ring together again? (5 Marks)
You can access the solutions to this Unit Test here.
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