Addition
435+335
770
300-250
50
90+32
122
4+(-4)
0
5-(-4)
9
98-65
33
Joe was 2,000 feet above sea level.
His friend Bob was 1,568 feet below sea level.
Joe wanted to know what the distance was between thew.
3,568
-15+(-17)
-32
-54-13
-67
40-(-57)
97
Billy said -89+56 is -33. Is he wrong, and if so explain his error.
He is right!
-35+27
-8
35-(-60)
95
32*-21
-672
-98+50
-48
Harry was playing football.
He started at twenty yards.
He got the ball, but lost ten yards.
The next play he gained fifteen, and the next play he lost five.
What yard is he at now?
20
-435+847
412
-50*-12*-6
-3,600
-57+76+-64
-45
Sally says -12*-12*-5 is -720, but Sarah says -12*-12*-5 is 720. Who's right? Explain.
-720
-12*-12 is 144, since two negatives equal a positive
Times negative five is is 720, since different signs equal a negative when multiplied.