The DAV Class 5 Maths Book Solutions Pdf and DAV Class 5 Maths Chapter 3 Worksheet 7 Solutions of Multiples and Factors offer comprehensive answers to textbook questions.
DAV Class 5 Maths Ch 3 Worksheet 7 Solutions
Question 1.
Fill in the blanks.
(a) Is 1 a prime number? ______ (Yes/No)
Solution:
No, 1 is neither prime nor composite.
(b) Write the smallest-
(i) Prime number : _______
(ii) Composite number : _______
(iii) Odd prime : ________
(iv) Even composite : ________
(v) Odd composite : ________
Solution:
(i) 2
(ii) 4
(iii) 3
(iv) 4
(v) 9
Question 2.
Which of the following are prime numbers?
10, 12, 15, 17, 19, 21, 25, 33, 35, 37
Solution:
17, 19, 37
Question 3.
Which of the following are composite numbers?
14, 15, 19, 20, 24, 27, 29, 30, 32
Solution:
14, 15, 20, 24, 27, 30, 32
Question 4.
Write all the prime numbers between 20 and 30.
Solution:
23, 29 have 2 factors: 1 and itself.
Question 5.
Write all the composite numbers between 40 and 50.
Solution:
42, 44, 45, 46, 48, 49
DAV Class 5 Maths Chapter 3 Worksheet 7 Notes
- Prime number: A number with exactly two distinct factors (1 and the number itself) is called a Prime number.
For example, 2, 3, 5, 7, 11, 13, 17 … are prime numbers.
Factors of 2 = 1, 2.
Factors of 3 = 1, 3, and so on. - Composite number: A number with more than two factors is called a Composite Number.
For example 4, 6, 8, 10, 12, 14, 15, 16, 18, 20, 21,…… are composite numbers. - 1 is neither a prime nor a composite number.
- The smallest prime number is 2.
- The smallest composite number is 4.