Page 36 - Math 7

Unit Operations on Whole Number
3

3.1 Factors and Multiples - Looking back

Classroom - Exercise

1. Let's say and write the factors of the following numbers. Then circle the prime
factors.

a) Factors of 4 are ................................ b) Factors of 6 are ................................
c) Factors of 12 are ................................ d) Factors of 18 are ................................
2. Let's say and write the first five multiples of the following numbers.

a) 2 o .............................................. b) 3 o ..............................................
c) 4 o .............................................. d) 5 o ..............................................

3. Let's say and write the square and cube numbers of the following numbers.
a) square of 2 = ....... Cube of 2 = ....... b) square of 3 = ....... Cube of 3 = .......
c) square of 4 = ....... Cube of 4 = ....... d) square of 5 = ....... Cube of 5 = .......
e) square of 10= ....... Cube of 10= ....... f) square of 20= ....... Cube of 20= .......

4. Let's say and write the square roots and cube roots of the following numbers.

3
3
a) 4 = .................... 8 = .................... b) 9 = .................... 27 = ....................
3
3
c) 16 = .................. 64 = ................. d) 25 = .................. 125
= ................
3
e) 100 3 = ................ 8000 = ................
= ................ 1000 = ................ f) 400
Let’s take a whole number 24.
The possible factors of 24 are 1, 2, 3, 4, 6, 8, 12 and 24. Among these factors, 2 and
3 are the prime numbers and they are called the prime factors. Thus, the factors of
whole number divide it without leaving a remainder.

Again, let’s take a whole number 9.
A few multiples of 9 are: 1 × 9 = 9, 2 × 9 = 18, 3 × 9 = 27, 4 × 9 = 36, 5 × 9 = 45, ...
Thus, multiple of a whole number is the number obtained multiplying the whole
number by any natural number.

Vedanta Excel in Mathematics - Book 7 34 Approved by Curriculum Development Centre, Sanothimi, Bhaktapur