The length of marisa loaf of bread is 56 centimeters. she cut off of 32 centimeters of bread. what is the length of what she has left?

All you have to do is use simple addition.

You know that the bread she had was 56 centimeters.
She cut off 32 centimeters.
Your problem should look like this.
                                                           56
 Subtract the 3 from the 5   ------>   - 32   <---- subtract the 2 from the six.
                                                             =
                                                             24
The answer is 24 cm.

I attached a diagram for you.