Mohan lives 4 3 8 km away from his school. He has covered 18 7 6 km. How much distance has he still to go?
If its 438km and 1876 then... mate, you've passed it along time ago .
Unless its 438km and 18.76
$${\mathtt{438}}{\mathtt{\,-\,}}{\mathtt{18.76}} = {\mathtt{419.24}}$$
We need more clarification, here...
What is 18 7 6 km ????