[tex]2 \frac{5}{15} + 3 \frac{1}{18} - 4 \frac{1}{6} = 2 + \frac{5}{15} + 3 + \frac{1}{18} - ( 4 + \frac{1}{6} ) = 2 + \frac{5}{15} + 3 + \ \frac{1}{18} - 4 - \frac{1}{6} = ( + 3 - 4) + \frac{5}{15} + \frac{1}{18} - \frac{1}{6} = 1 + \frac{2}{9} = 1 \frac{2}{9} [/tex]
