69 MathsExchange-A11.indd 69 8/1/08 :11:11 PM
t T 70 MathsExchange-A11.indd 70 8/1/08 :11:16 PM
71 MathsExchange-A11.indd 71 8/1/08 :11: PM
7 MathsExchange-A11.indd 7 8/1/08 :11:4 PM
73 MathsExchange-A11.indd 73 8/1/08 :11:5 PM
74 MathsExchange-A11.indd 74 8/1/08 :11:5 PM
75 MathsExchange-A11.indd 75 8/1/08 :11:6 PM
5 3 5 3 = 4 15 5 3 5 5 3 5 4 15 5 3 4 15 76 MathsExchange-A11.indd 76 8/1/08 :11:7 PM
1 1 1 4 1 1 3 3 5 3 = 1 4 = 1 8 = 9 = 4 15 77 MathsExchange-A11.indd 77 8/1/08 :11:8 PM