Sketch a drawing using integer tiles for each operation below and simplify the expression.

1.  $−5 + \left(4\right)$

   Answer (a):

   $−5 + 4 = −1$
   Remember to sketch a drawing.

2.  $−5 − \left( −4\right)$

   Hint (b):

   Refer to the Lesson 3.4.2 Math Notes.