## Basic College Mathematics (10th Edition)

$\frac{2}{3}$
$5\frac{1}{4}-4\frac{7}{12}$ = $\frac{5\times4+1}{4}-\frac{4\times12+7}{12}$ = $\frac{21}{4}-\frac{55}{12}$ = $\frac{21\times3}{4\times3}-\frac{55}{12}$ (LCM of 4 &12 is 12) = $\frac{63}{12}-\frac{55}{12}$ = $\frac{63-55}{12}$ = $\frac{8}{12}$ = $\frac{2}{3}$ (divide by common factor 4)