7 meters
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A chalkboard typically has a thin layer of iron beneath the surface. This iron layer allows the magnet to stick to the chalkboard. The magnetic force between the magnet and the iron in the chalkboard is what causes them to attract and stick together.
A chalkboard becomes whiter as it gets dirtier with chalk dust.
Well, darling, it really depends on the size of that chalkboard. If it's a massive one, go for meters or even kilometers if you're feeling fancy. But if it's just a cute little one, centimeters or millimeters will do just fine. Just make sure you don't whip out a ruler longer than the board itself, that would be a bit overkill, don't you think?
There are 10 meters in 1000 centimeters.
There are 13.05 feet in 3.98 meters.