A measuring tape or a laser distance measurer would be suitable tools to measure the height of a ceiling.
80 millimeters
there about 61 to 84 children in a classroom
Ceiling of Sant'Ignazio Church (Roma) by Andrea Pozzo, 1691-1694
5 through 6 computers average in 1 regular classroom and if in gifted or magnet 10 through 15 average in 1 classroom.
There is no set standards
Meters works well, so do centimeters
13.7 millimeters
1 meter = 1,000 millimeters 2 meters = 2,000 millimeters 3 meters = 3,000 millimeters . . . 6,384 meters = 6,384,000 millimeters
Average ceiling height
Ceiling height varies, 8'3" and up
2m
The Elmo is great for classroom use, especially mounted on the ceiling.
Height = 1000/(pi*42) = 19.89436769 mm
The standard ceiling height is 8 feet.
1,676.4 millimeters.
4m