Question

find HCF of 84 and 90 by prime factorisation

Answer 1

Answer:

6

Step-by-step explanation:

From this we get 2 and 3 common so the HCF will be 3 multiply by 2 gives us 6

Answer 2

Answer:

6

Step-by-step explanation:

Let's start with 84,

          2    84                                       2   90

          2    42                                       3   45

          3     21                                       3    15

          7      7                                        5     5

                  1                                                1

Factors of 84 - 2 * 2 * 3 * 7

Factors of 90 - 2 * 3 * 3 * 5

Now here you have to find the common factors that are there in both the factors of those numbers

You should get 2 and 3

To find HCF of any 2 number, you must multiply the common factors in order to get them

Common Factors - 2 and 3

HCF - 2 * 3 = 6

The answer  is 6