Since the temperature was -13 and the temperature change was 7 degrees, you have to add 7 to -13. Since -13 is a negative number you could subtract 7 from -13 and get the same answer. Basically subtract 7 from 13 and add a negative sign in front of it.
Since putting fractions from least to greatest by using negatives the number or fraction has to be closed to 0. -5/6 is the farthest from 0 so it'll be the least -4/9 is closes to 0 so -4/9 is the most.
