Question

a pencil is about how long?
choose the correct answer below.
10 cm
10 mm
10 m

Explanation:

Step1: Consider unit - size relationship

1 m = 100 cm, 1 cm=10 mm. 10 m is extremely long for a pencil, much longer than a normal - sized room. 10 mm = 1 cm, which is very short, about the length of a small eraser. A typical pencil is around 10 - 20 cm long.

Answer:

10 cm