Question

Draw a diagram to represent each of these situations. Then write an addition expression that represents the final temperature.


The temperature was 80 ℉ in Arizona and then fell 20 ℉ during the night.






The temperature was -13 ℉ in Minneapolis and then rose 9 ℉ in the morning.






The temperature was -5 ℉ in Denver and then fell 8 ℉ by the morning.

Answer 1

Answer:

1) 80+(-20)

2) -13+9

3) -5+(8)

I don't quite know how to explain

Just think about 1) 60 is the new temperature, in order to have an addition problem we're going to have to use negative numbers. Since we had to subtract 20, in order to use addition it would be 80+(-20).