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Explanation:
1 cm = 10 mm
therefore,
9 cm = 9×1 cm = 9×10 mm = 90 mm.
we need to multiply 90 mm by what factor to get 3 mm ?
90 × f = 3
f = 3/90 = 1/30
so, we convert 9 cm to 3 mm by multiplying 9 cm by 1/30 (or by dividing 9 cm by 30).
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