It's best to begin by dividing by the lowest possible prime. It's even, so divide by 2.

180/2 = 90. So the first prime factor is 2.

90/2 = 45. Prime factors so far (2*2)

45/5 = 9. Prime factors so far (2*2*5)

9/3=3. 3 is a prime number so that gives 3*3.

Prime factorization of 180 is 2*2*3*3*5

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