Question

Find the hcf for 30 and 42

Answer 1

Answer:

$30 = 2 \times 3 \times 5 \\ 42 = 2 \times 3 \times 7$

common factors = 2 and 3

HCF = 2×3=6

therefore, HCF of 30 and 42 is 6

Answer 2

HCF of 30 and 42 is 6

Given :

The numbers 30 and 42

To find :

HCF of 30 and 42

Solution :

Step 1 of 3 :

Write down the given numbers

The given numbers are 30 and 42

Step 2 of 3 :

Prime factorise the given numbers

30 = 2 × 3 × 5

42 = 2 × 3 × 7

Step 3 of 3 :

Find HCF of 30 and 42

We know that for the given two or more numbers HCF is the greatest number that divides each of the numbers

Hence the required HCF

= HCF of 30 and 42

= 2 × 3

= 6

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