Because the classroom is longer and if you use inches it would take to long.
Using meters takes less time.
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Meters are about the same distance as Yards (1 Yard = 3 Feet) and while Yards may be just as convenient, students will have less trouble doing conversions with the metric units.
Let's say a classroom might be 24 feet along one wall, or 8 yards.
Meters are pretty close in length to yards. Although they aren't exactly the same, they're close enough for student usage. So let's say the classroom is also 8 meters.
You can do many things with these 8 yards, and many more things with these 8 meters.
Although students may have more fun calculating by the cumbersome scaling factors of the English system, they will have more to do with SI-prefix units.
It really depends on how old your students are and what you're trying to teach them.
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METERS!!!The unit of measurement you would use to measure the width of your classroom is meters.
Meters
meters or yards
I would use a tape measure. This would require one person to help me, since the tape measure would have to be held at both ends. Even if the classroom is longer than the tape measure, I could just mark the full extent of the tape and then measure again from there.
Meters