Answer
Estimate=8
Exact=7$\frac{3}{4}$
Work Step by Step
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$\frac{3}{4}$
