Question

Add: 3800 m + 4 km = ____.

• A. 7800 m
• B. 3804 m
• C. 78 km
• D. 4200 m

Answer 1

The correct option is A

7800 m

To convert a larger unit (km) to a smaller unit (m) we multiply by the conversion factor.

We know that, 1 km = 1000 m
Therefore, 4 km = 4 $\times$ 1000 = 4000 m

So, 3800 m + 4000 m = 7800 m