Table of contents |
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Multiple Choice Questions (MCQs) |
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Fill in the Blanks |
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True or False |
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Answer the following questions |
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Q1: Which of the following is a prime number?
(a) 49
(b) 51
(c) 53
(d) 55
Q2: What is the first common multiple of 3 and 5?
(a) 10
(b) 12
(c) 15
(d) 20
Q3: How many prime numbers are there between 1 and 10?
(a) 2
(b) 3
(c) 4
(d) 5
Q4: Which pair of numbers is co-prime?
(a) 12 and 18
(b) 14 and 21
(c) 8 and 9
(d) 10 and 20
Q5: The smallest number that is a multiple of both 3 and 4 is:
(a) 6
(b) 9
(c) 12
(d) 15
Q1: The smallest prime number is _____.
Q2: Numbers that have only two factors, 1 and the number itself, are called _____.
Q3: The common multiples of 3 and 5 within the first 100 numbers are _____, _____, and _____.
Q4: The Sieve of _____ is a method used to find all prime numbers up to a certain number.
Q5: Numbers that are neither prime nor composite are _____.
Q1: 9 is a prime number.
Q2: The number 2 is the only even prime number.
Q3: All multiples of 4 are also multiples of 2.
Q4: If a number is divisible by 8, it is also divisible by 4.
Q5: The number 37 is a composite number.
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Worksheet: Prime Time - 1
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Q1: List all the prime numbers between 10 and 20.
Q2: Find the common factors of 24 and 36.
Q3: What is the prime factorization of 72?
Q4: Identify two numbers between 1 and 50 that are co-prime.
Q5: What is the smallest multiple of 5 that is also a multiple of 3?
Q6.Is the first number divisible by the second? Use prime factorisation.
a. 150 and 25
b. 84 and 12
Q7: Find three prime numbers, all less than 50, whose product is 2310.
Q8: What is the smallest number whose prime factorization has:
Q10. Which of the following numbers is the product of exactly three distinct prime numbers: 50, 84, 105, 280?
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