Colored blocks

Tucker and his classmates placed colored blocks on a scale during a science lab. The brown block weighed 8.94 pounds and the red block weighed 1.87 pounds. How much more did the brown block weigh than the red block?

Correct result:

d =  7.07 lb

Solution:

$$\begin{gathered} b=8.94\text{ lb } \\ r=1.87\text{ lb } \\ d=b-r=8.94-1.87={\displaystyle \frac{707}{100}}={\displaystyle \frac{707}{100}}\text{ lb}=7.07\text{ lb} \end{gathered}$$

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