primary school large then 3600mm * 1000mm
middle school large then 4000mm * 1000mm
I am pretty sure it's a teacher.
This depends on many factors.
Blackboards are typically made of a material that is softer than chalk, such as slate or porcelain. When you write on a blackboard with chalk, the friction between the chalk and the board causes the chalk to wear down and leave behind tiny particles of sand or abrasive material embedded in the chalk. These abrasive particles then scratch the surface of the blackboard as you write, creating marks that can be difficult to erase.
A Blackboard site is an online platform commonly used by educational institutions for delivering course materials, assignments, and communication between instructors and students. It provides a virtual space for hosting discussions, sharing resources, submitting work, and grading assessments.
Keep googleing for a usefule site that has actual content and fewer ad revenue spots...
Matilda wrote "I'm big, you're little. I'm right, you're wrong, and there's nothing you can do about it" on the blackboard.
2 inches by 4 inches.
Blackboard Inc. was created in 1997.
The population of Blackboard Inc. is 1,780.
advantages and disadvantages of blackboard
The duration of Murder on the Blackboard is 1.18 hours.
The duration of Beyond the Blackboard is 1.67 hours.
Beyond the Blackboard was created on 2011-04-24.
Meter is used in finding the width of the blackboard.
Go to google and type in your state and blackboard and it should come up.
There is more than one size of blackboard...
"Blackboard" in Chinese is 黑板 (Hēi băn)