The quotient is . 

For low estimate, round the divisor, 218 up and replace the dividend, 31,217, with a number that is divisible by 300  and is less than 31,217.

For high estimate, round the divisor, 218 down and replace the dividend, 31,217, with a number that is divisible by 200  and is greater than 31,217.

The quotient is between 200 and 300.