We need to convert 7km and 123m to meters.

Since we know that there are 1000m for every 1 km, we have

`= 7km*((1000m)/(1km)) + 123m`

cancel out like units.

`=7(1000m)+123m`

`=7000m+123m`

`=7,123m`

Convert `7 km 123 m` to meters.

First their are `1000m` in `1 km` . Therefore, there are `7000` meters in `7` km.

So in `7km` `123m` there are `7,123 m` .

**The solution is 7,123 m.**