Question

reduce 72:81 to its simplist form

Answer 1

Divide by 9/9 and you get 8/9 :)

Answer 2

$\frac { 72 }{ 81 } \\ \\ =\frac { 8 }{ 9 } \cdot \frac { 9 }{ 9 } \\ \\ =\frac { 8 }{ 9 } \cdot 1\\ \\ =\frac { 8 }{ 9 }$