Chocolate buyer

Peter bought 1/2 a pound of chocolate at Rocky Mountain Chocolate Factory. Later, he went to the sweet shop and bought 6/9 of a pound more chocolate. How much chocolate did he buy that day?

Correct answer:

m =  1.1667 lb

Step-by-step explanation:

$$\begin{gathered} a=\frac{1}{2}=0.5\text{lb} \\ b=\frac{6}{9}=\frac{2}{3}\doteq 0.6667\text{lb} \\ m=a+b=\frac{1}{2}+\frac{2}{3}=\frac{3}{6}+\frac{4}{6}=\frac{3+4}{6}=\frac{7}{6}=\frac{7}{6}\text{lb}=1.1667\text{lb} \end{gathered}$$

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