The answer depends on the units used for 13.6: it should be obvious to anybody that the answers for 13.6 inches and 13.6 micrometres will be very different.
136 rounded to the nearest 100 is 100.
140/100
The answer is 136
9 mm
It is 0 cm.
136 mm
Square root of 136 to the nearest tenth is 11.7.
136 rounded to the nearest 100 is 100.
60
From the information provided in the question, it is not possible to tell what unit you started with. If you started with 28 mm, the answer is 28 mm to the nearest mm.
The answer is 136
140/100
It is 140
140
136
25.4 mm = 1 inch. (1000 mm) / (25.4 mm/in) = 39.4 in (rounded to nearest tenth)
13.27 cm is equal to 132.7 mm when rounded to the nearest millimeter.