Answer: 24
Step-by-step explanation:
I find it helps to think of the positive version of each number.
So we need to find the distance from 54 to 30 on the number line. That's simply 54-30 = 24. There are 24 spaces between 30 and 54.
This trick only works when both numbers are originally negative together. The trick doesn't work when we have mix of positive and negative.