Question

What is the HCF of 10;20;30?

Answer 1

7 answers · Mathematics
Best Answer
FIRST METHOD-----------
Factor of 30 =1,2,3,5,6,10,15,30
Factor of 20 = 1,2,4,5,10,20
Factor of 10 = 1,2,5,10
--------------------------------------...
common factor =1,2,5,10
Highest Common Factor = 10
H.C.F =10 ANS.
SECOND METHOD-
PRIME FACTOR OF 30=2,3,5
PRIME FACTOR OF 20 =2,2,5
PRIME FACTOR OF 10 =2,5
--------------------------------------...
COMMON PRIME FACTOR=2,5
H.C.F. =2*5 =10 ANS.
THIRD METHOD --------
10)20(2
---20
----------
X
10)30(3
---30
---------------
X
H.C.F =10 ANS.

Answer 2

Answer

HCF of 10;20&30 is 10

Step by Step explanation:-

Step 1 List all the factors of 10;20&30

Step 2 Write all the common factors of these numbers

Step 3 Find the Greatest Common Factor i.e. 10

So, the answer is 10