alleryWhat is the smallest natural number by which 180 must be MULTIPLIED so that the product becomes a perfect square?
A3
B5
C9
D15
Answer & Solution
Correct answer: B. 5
**Prime factorise:** 180 = 2² × 3² × 5. The prime 5 appears an odd number of times.
To make all prime exponents even, multiply by 5: 180 × 5 = 900 = 30².
**So the smallest multiplier is 5.**
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