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\ 09-Nov-2025 Bharat Arora Proof-8 Reader’s Sign _______________________ Date __________

Mental Maths

21 st
Choose the correct option. Century #Critical Thinking
Skills
1. The smallest multiple of 15 is ____________.
a. 1 b. 30 c. 15 d. 5

2. 30 is a ____________ of 120.
a. factor b. multiple

c. common multiple d. common factor

3. An odd multiple of 7 between 35 and 56 is ____________.
a. 57 b. 49 c. 51 d. 53

4. Which is not a factor of 36?
a. 6 b. 1 c. 8 d. 9

5. Every number is a multiple of ____________.
a. 1 b. 10 c. 2 d. 3

6. Every number other than 1 has at least ____________ factors.
a. 1 b. 3 c. 2 d. 4

HOTS

21 st
Kavita and Hema have joined swimming classes. Century #Computational Thinking
Skills
Kavita goes on every 4th day, whereas Hema goes on

every 3rd day. Kavita and Hema joined the classes 20XX
on 12th May. Looking at the calendar, answer the
following questions:

1. On which dates has Kavita gone swimming?

2. On which dates will both the friends meet?

3. Starting from 12th May, after how many
days will both meet?

90 Mathematics 4