During a football game, Sam ran for a total gain of 39 yards on 13 plays and Steve ran for a total of -6 yards on 3 plays. What was the difference in the

39/13 = 3 yds per play

-6/3 = -2 yards per play

3 - (-2)  = 5 yds  difference in their averages

The temperature at noon was 20° By midnight, it had dropped to -4°. What was the difference in temperatures?

The greatest temperature change in over one 24- period occurred in Browning, Montana, on January 23 and 24, 1916. The temperature fell from 44° F to -56°F. What was the difference in temperature?