You will be better served if you learn to do unit conversions in general. All it takes is to multiply your starting value by a fraction formed by the unit conversion. In this case, the conversion is that 1 cm = 10 mm. You can make two different fractions: 1 cm/10 mm = 1 or 10 mm/1 cm = 1. Multiply by the form that will divide out the unit you are trying to eliminate.
In this case:
9 mm x (1cm/10 mm) = 9x1/10 cm = 9/10 cm = 0.9 cm
This type of operation is very easy and very routine.
Each centimetre equals 10 millimetres. So, 9 cm equals 90 mm.
1 cm = 10 mm 2 cm = 20 mm 3 cm = 30 mm . . 9 cm = 90 mm That's more than 77 mm.
9 cm and 3 mm is equal to 93 mm.
10 mm = 1 cm So 9 mm = 0.9 cm
10 mm = 1 cm ⇒ 9 mm = 9 ÷ 10 cm = 0.9 cm
1 cm = 10 mm 2 cm = 20 mm . . . 9 cm = 90 mm 10 cm = 100 mm 20 cm = 200 mm 30 cm = 300 mm
10 mm = 1 cm so 9 mm = 9/10 cm = 0.9 cm. Simple!
It might mean "9 cm 8 mm"
9 millimeters.
90 cm is greater than 9 mm
0.354331 in Algebraic Steps / Dimensional Analysis Formula 9 mm*1 cm 10 mm*1 in 2.54 cm=0.3543307087 in Direct Conversion Formula 9 mm*1 in 25.4 mm=0.3543307087 in
9 mm * 9 mm = 81 mm2 = 0.81 cm2