Basic College Mathematics (10th Edition)

Estimate=8 Exact=7$\frac{3}{4}$
Estimate by rounding the mixed numbers to the nearest whole number and subtracting. Estimate:30-22=8 29$\frac{1}{2}$-21$\frac{3}{4}$ 29$\frac{2}{4}$-21$\frac{3}{4}$ 28$\frac{6}{4}$-21$\frac{3}{4}$ 7$\frac{3}{4}$