Question

2 7/8 pounds of cheese used 1 1/4 to make sandwiches how much is left

Answer 1

first off, let's convert all mixed fractions to improper fractions.

`\stackrel{mixed}{2(7)/(8)}\implies \cfrac{2\cdot 8+7}{8}\implies \stackrel{improper}{\cfrac{23}{8}} ~\hfill \stackrel{mixed}{1(1)/(4)} \implies \cfrac{1\cdot 4+1}{4} \implies \stackrel{improper}{\cfrac{5}{4}} \\\\[-0.35em] ~\dotfill\\\\ \stackrel{ whole }{\cfrac{23}{8}}-\stackrel{ used }{\cfrac{5}{4}}\implies \cfrac{(1)23~~ - ~~(2)5}{\underset{\textit{using this LCD}}{8}}\implies \cfrac{23-10}{8}\implies \cfrac{13}{8}\implies \stackrel{ leftover }{1(5)/(8)}`