There are 1000 millimeters in a meter. There are 1000 meters in a kilometer.
Given this information the answer is obvious.
greater than
Greater.
1 centimeter = 10 millimeters 4 centimeters = 40 millimeters That's less than 500 of them.
1000 times less
Neither.
Greater than; 90cm = 900mm1cm = 10mm1mm = 0.1cm
7 decimeters is greater than 600 millimeters. There are 100 millimeters in each decimeter. So 7dm = 7 * 100 mm, or 700mm. 700 is greater than 600.
Every centimeter has 10 millimeters in it, so chances are that90 of them will be longer than 9 millimeters.
150 millimeters squared is more.
less
I'd the same
178 mm = 17.8 cm which is greater than 15 cm