Question

Subtract:
20 km - 10 m =_

• A. 10 m
• B. 10 km
• C. 19990 km
• D. 19990 m

Answer 1

The correct option is D 19990 m

Here, convert 20 km to m,
From the conversion Table we see that
To convert larger units (km) to smaller units (m) we multiply by the conversion factor.
We know that 1km = 1000 m
20 km = 20 $\times$ 1000 m
=20,000 m
now, 20,000m - 10 m
= 19,990 m.
Answer: option D. 19,990 m