Question

What number is bigger 2 7/8 or 2.79? 

Answer 1

$\frac{1}{8}=\frac{1\cdot125}{8\cdot125}=\frac{125}{1000}=0.125\\\\\frac{7}{8}=7\cdot\frac{1}{8}=7\cdot0.125=0.875\\\\2\frac{7}{8}=2.875\ is\ bigger\\\\2\frac{7}{8}=2.875 > 2.79$

Answer 2

27/8 is bigger because when you divide 27 to 8 you will get 3.37 so 3.37 is bigger than 2.79.