Just count the number of squares:
(9+5)*2=14*2=28
1 + (-5) becomes 1 - 5 because you are adding a negative number.
1 - 5 is -4
When you divide 287 by 68, when it is not rounded, you will get 4.22058823529... (repeated decimal), but when you round it, you can either get the following: 4.22, 4.2, or 4 (choose which ever you want to pick out of these rounded forms.)
Hope this helped!
Nate
