Math

Front 1

9*1

Back 1

9

Front 2

9*2

Back 2

18

Front 3

9*3

Back 3

27

Front 4

9*4

Back 4

36

Front 5

9*5

Back 5

45

Front 6

9*6

Back 6

54

Front 7

9*7

Back 7

63

Front 8

9*8

Back 8

72

Front 9

9*9

Back 9

81

Front 10

9*10

Back 10

90

Front 11

9*11

Back 11

99

Front 12

9*19

Back 12

108

Front 13

9*13

Back 13

117

Front 14

9*14

Back 14

126

Front 15

9*15

Back 15

135