This has two significant digits, because the limiting datum is 12.
10
There are 120 tens in 1200. This is because 1200 divided by 10 equals 120. Each group of ten represents one ten in the number 1200.
1200 millimeters is 120 centimeters
There are 120 of them.
1200 milimetres = 120 centimetres.
1200 of them.
120
120
120 centimeters
A significant figure is basically counting how many digits there are: In this case this number is to FOUR significant figures because there are FOUR digits. Here's some more examples: When you have zero's in front of the number, these do not count as digits: so, if you had 0.0034, you only count the 3 and 4 as digits so this would be to TWO significant figures. However, if you have 0.003404, you must count the zero in between the two four's because this is part of the number - there are FOUR significant figures here.
There are 10 millimeters in one centimeter. Therefore, 1200 millimetres is equal to 1200/10 = 120 centimetres.
It can last anywhere from 120 - 1200 seconds.