Final answer:
To convert liters to milliliters, multiply the number of liters by 1,000. In the case of 4.5 liters, the equivalent amount in milliliters is 4,500.
Step-by-step explanation:
To convert liters to milliliters, you multiply the number of liters by 1,000.
In this case, Karen is preparing 4.5 liters of punch. So, to find out how many milliliters are in 4.5 liters, you would multiply 4.5 by 1,000.
4.5 liters x 1,000 = 4,500 milliliters