Answer: The answer is NO.
900 cm is not greater than 9000 mm.
Step-by-step explanation: We are given to check whether 900 cm is greater than 9000 mm or not.
We have
100 cm = 1 meter.
So, 1 cm

Therefore, 900 cm will be

Also,
1000 mm = 1 meter.
So, 1 mm

Therefore, 9000 mm will be

So, 900 cm = 9000 mm.
Thus, 900 cm is equal to 9000 mm.
That is, 900 cm is not greater than 9000 mm.