## Basic College Mathematics (10th Edition)

Estimate: 24 - 18 = 6 Exact: $5\frac{5}{8}$
$24-18\frac{3}{8}$ Lets first Find Estimate of fraction: $18\frac{3}{8}$=18 $24-18\frac{3}{8}$ = 24 - 18 = 6 Now find Exact: $24-18\frac{3}{8}$ = $24-\frac{18\times8+3}{8}$ = $24-\frac{147}{8}$ = $\frac{24\times8}{1\times8}-\frac{147}{8}$ (Least common multiple of 1 & 8 is 8) = $\frac{196}{8}-\frac{147}{8}$ = $\frac{192-147}{8}$ (Subtraction of fraction with same denominator) = $\frac{45}{8}$ = $5\frac{5}{8}$