Question

Find the prime factors (using prime E
numbers:
(a) 90​

Answer 1

Answer:

Step-by-step explanation:

Prime Factors of 90

The number 90 is a composite number. Now let us find the prime factors of 90.

The first step is to divide the number 90 with the smallest prime factor,i.e. 2 and divide the output again by 2 till you get a fraction or odd number.

90 ÷ 2 = 45;

Divide 45 by 2.

45 ÷ 2 = 22.5; fraction cannot be a factor.

        Therefore, moving to the next prime numbers, 3, 5, 7 and so on.

Divide 45 by 5.

45 ÷ 3 = 15

15 ÷ 3 = 5

Now, we know 5 is a prime number and it has only two factors; 1 and 5. Therefore, we cannot continue with the division method further.

So, the prime factors of 90 are 2 × 3 × 3 × 5 or 2 × 32 × 5, where 2, 3 and 5 are the prime numbers.

Hope it helps

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