Ch – 1 Real Numbers – 1

Q.1: Use Euclid’s division algorithm to find the HCF of :

a) 70 and 125

b) 65 and 117

c) 222 and 468

Q.2: Express each number as a product of its prime factors:

a) 175

b) 408

Q.3: Explain why 3 x 5 x 7 + 7 is a composite number.

Q.4: Find the LCM and HCF of the following integers by applying prime factorisation:

a) 96 and 108

b) 72 and 120

Answers:

Q.1: a) 5 b) 13 c) 6

Q.2: a) 5 x 5 x 7 b) 2 x 2 x 2 x 3 x 17

Q.4: a) HCF = 12, LCM = 864

b) HCF = 24, LCM = 360

Published by Priya Prakash

In the midst of winter, i found there was within me an invincible summer ~ Albert Camus

Leave a Reply

Fill in your details below or click an icon to log in:

WordPress.com Logo

You are commenting using your WordPress.com account. Log Out /  Change )

Google photo

You are commenting using your Google account. Log Out /  Change )

Twitter picture

You are commenting using your Twitter account. Log Out /  Change )

Facebook photo

You are commenting using your Facebook account. Log Out /  Change )

Connecting to %s

%d bloggers like this: