Page 70 - Maths Class 04
P. 70
Factor Tree
There are many numbers which can be multiplied by more than 2 factors.
Let us consider the number 16.
16 can be built with 2 factors ® 2 × 8
16 can be built with 3 factors ® 2 × 2 × 4
16 can be built with 4 factors ® 2 × 2 × 2 × 2
Factor tree help us in finding different ways of making number by multiplying.
« Factor tree gives as many branches as possible.
« The encircled number can be broken up further.
« We stop giving branches, i.e., breaking up the numbers when we need to
use 1 as a factor.
Example : Make the factor tree of a. 18 b. 36 36
Solution : a. b. 2 × 18
18
2 × 9 2 × 9
3 × 3 3 × 3
Carry On
Make two different factor trees for 72.
72 72
Common Factors
Common factors of two or more numbers are those numbers which divide
all the numbers exactly.
Mathematics-4 70
