\begin{tabular}{@{}lrr@{}c@{}rcr@{}}
\toprule
\thead{Ingredient}  & \thead{Baker's math}  & \multicolumn{5}{l}{\thead{Calculated value}} \\ \midrule
Flour               & \qty{100}{\percent}   & 1400 &\times& 1 &=& \qty{1400}{g}            \\ 
Water               & \qty{60}{\percent}    & 1400 &\times& 0.6 &=& \qty{840}{g}           \\ 
Sourdough starter   & \qty{10}{\percent}    & 1400 &\times& 0.1 &=& \qty{140}{g}           \\ 
Salt                & \qty{2}{\percent}     & 1400 &\times& 0.02 &=& \qty{28}{g}           \\ \bottomrule
\end{tabular}