Question
Find the prime factorisation of $980.$

Answer

Here, we shall proceed as below:
We divide the number $980$ by $2, 3, 5, 7$ etc. in this order repeatedly, So long as the quotient is divisible by that number.
Thus, the prime factorization of $980$ comes out to be: $2 \times 2 \times 5 \times 7 \times 7$

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