Answer
Estimate 800 pounds
Exact $833 \frac{1}{3}$ pounds
Work Step by Step
The weight of the water in the 2 aquariums is $100 \times 8 \frac{1}{3}$.
Estimate
$100 \times 8 = 800$
Solve
$100 \times 8 \frac{1}{3}$ = $100 \times \frac{25}{3}$ = $\frac{2500}{3}$ = $833 \frac{1}{3}$
Check
$833 \frac{1}{3} \div 100$ = $\frac{2500}{3} \div 100$ = $\frac{2500}{3} \times \frac{1}{100}$ = $\frac{25}{3} \times \frac{1}{1}$ = $\frac{25}{3}$ = $8 \frac{1}{3}$
