Garth estimated the heigh of the door to his claroom in meters what is reasonable estimate?

A reasonable measure for the height of the door would be 2.23 meters

Step-by-step explanation:

We use three units of measurement in our daily life.

Centimeter, Meter and Kilometer

When comparing the three units centimeter is the smallest unit and kilometer is the largest.

1 meter = 100 cm

1 kilometer = 1000 meter = 100000 centimeter

If we measure the height of the classroom's door in centimeter which is approximately 223 cm, it is better to convert it into a unit higher than centimeter. We know that 100 cm is equal to 1 meter. So, instead of writing 223 cm it is better to write 2.23 m, neither 0.223 Km. If the number lies between 100 cm ≤number <100,000 cm, convert it into meters by dividing the number by 100, which is best unit of measurement.