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Question Bank: 1. Choose The Correct Option

The document is a question bank containing various mathematical problems related to prime numbers, factors, multiples, divisibility, and HCF/LCM calculations. It includes multiple-choice questions, fill-in-the-blank statements, and true/false questions. The content is structured to test knowledge in basic number theory and arithmetic concepts.

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Shefia Rawther
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30 views1 page

Question Bank: 1. Choose The Correct Option

The document is a question bank containing various mathematical problems related to prime numbers, factors, multiples, divisibility, and HCF/LCM calculations. It includes multiple-choice questions, fill-in-the-blank statements, and true/false questions. The content is structured to test knowledge in basic number theory and arithmetic concepts.

Uploaded by

Shefia Rawther
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
Available Formats
Download as PDF, TXT or read online on Scribd
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Question Bank

1. Choose the correct option. b. The numbers 49 and 51 co-prime.


a. The set that has all prime numbers is c. If a number is divisible by a given number,
then it is divisible by its multiples also.
i. 2, 23, 31, 33, 7 ii. 2, 23, 31, 53, 37
iii. 3, 5, 7, 19, 27 iv. 7, 27, 37, 47, 57 d. If 15 divides 45, then the factors of 15, 5
and 3 also divide 45.
b. A number is called a perfect number if it is
equal to the sum of its factors. The perfect 4. Answer the following.
numbers are
a. Find all the factors of 80.
i. 2 and 28 ii. 1 and 5
b. Find the first three multiples of 23.
iii. 6 and 14 iv. 6 and 28
c. Write the prime numbers between 10–50.
c. Which of these numbers are divisible by 6?
i. 2852 ii. 2652 d. Check the divisibility of 312642 by 3 and 9.

iii. 6663 iv. 3333 e. Check the divisibility of 476918 by 11.

d. If a number is divisible by 18, then it is f. Find the HCF of the numbers 72 and 240 by
divisible by division method.
i. 7 ii. both 2 and 9 g. Find the LCM of the numbers 130, 175 and
196.
iii. 8 iv. 4 and 9
h. Find the least five-digit number which
e. What should b added to 280 to make it
when divided by 20, 40, and 75 leaves
exactly divisible by 6?
remainder 9 in each case.
i. 0 ii. 4
i. What least value should be given in the
iii. 2 iv. 6 hundreds place so that the number 453_89
is divisible by 11?
2. Fill in the blanks:
j. Linda completes one round of a running
a. The HCF of two prime numbers is always track in 10 minutes and Trushna completes
. it in 8 minutes. How long will it take for
b. The smallest prime number is both to arrive at their starting point
. together, if they start at the same time and
maintain their speed?
c. The smallest composite number is
.
d. The number 1 is the only number that is
neither nor .
e. The numbers which are not multiples of 2
are called numbers.

3. State whether the following statements


are true or false.
a. The sum of even numbers is always even.

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