Omg ! i am literally struggling and this is very important

Its 2.34 you need to correct your teacher it was probably a honest mistake

Your answer is 234 because the grid goes by 100 and if the grid is fully shaded it means that it is 100. So you take the two fully shaded grids and make them 200. Next you add the 3 of the ten columns and that makes 30 and take the 4 shaded squares and combine the two. Finally add them all together and get 234. Step by step equations down below.

Equations:

100+100=200
30+4=34
200+34=234

If this was not what you needed help on than comment down below and I can help you. Hope this helped