Question

How to convert 9cm to3mm​

Answer 1

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).