First you can find the area of a rectangle by multiplying its length by its width.
0.45 km×0.40 km=0.18 km².
In order to convert this from kilometers to meters, multiply 0.18 by 1,000, since 1 kilometer is equal to 1,000 meters.
0.18×1,000=180
**edit**
180×1,000=180,000
The area of the field is 180,000 m², or square meters.
