Answer:
2
Step-by-step explanation:
Round the divisor to the nearest 10 or 100, depending on how many digits are in the divisor.
Round the dividend to the nearest 10, 100, or 1,000 so that all of the digits, except the first one are zeros.
Divide 600 by 30.
Compare your estimate to the exact answer to determine if the exact answer is reasonable.
