5. 98=☐+8 64 = 60 +☐ 12-9+6 13-6-4 80 -20 - 60 100-10-40

98= 90+8

64 = 60 +4

12-9+6 = 9

13-6-4 = 3

80 -20 - 60 = 0

100-10-40 = 50