A forest donated 3918 tree seedlings to 23 schools. by rounding off each number to the nearest 10, estimate the number of tree seedlings donated to each school

The number of tree seedlings is 3918. The digit in the ones place is 8, which is 5 or greater, so we round up the tens digit.
$3918 \approx 3920$

The number of schools is 23. The digit in the ones place is 3, which is less than 5, so we round down (keep the tens digit as it is).
$23 \approx 20$

Divide the rounded number of seedlings by the rounded number of schools.
$\text{Estimated seedlings per school} = \frac{\text{Rounded total seedlings}}{\text{Rounded number of schools}}$
$\text{Estimated seedlings per school} = \frac{3920}{20}$
$\text{Estimated seedlings per school} = 196$

The estimated number of tree seedlings donated to each school is 196.