## Basic College Mathematics (10th Edition)

Estimate: 50 - 47 = 3 Inch Exact: $3\frac{3}{8}$ inch
Difference in height = This yr height - last year height = 50 inch - $46\frac{5}{8}$ inch First Let's find estimate: $46\frac{5}{8}$ round to 47 (rounded to nearest whole number) Estimate: 50 - 47 = 3 Inch Now, Let's find Exact: = 50 inch - $46\frac{5}{8}$ inch = 50 inch - $\frac{46\times8+5}{8}$ inch = 50 inch - $\frac{373}{8}$ inch = $\frac{50\times8}{8} - \frac{373}{8}$ inch (LCM of 1 & 8 is 8) = $\frac{400}{8} - \frac{373}{8}$ inch = $\frac{400-373}{8}$ inch = $\frac{27}{8}$ inch = $3\frac{3}{8}$ inch