Convert 18 gallons to mL . Keep in mind, there are 3.79 liters in a gallon and \( 1,000 \mathrm{~mL} \) in 1 liter. Select one:

To convert 18 gallons to mL, first, let’s convert gallons to liters. Since there are 3.79 liters in a gallon, multiplying 18 gallons by 3.79 gives us 68.22 liters. Now, to convert liters to milliliters, we multiply by 1,000: \( 68.22 \, \text{liters} \times 1,000 \, \text{mL/liter} = 68,220 \, \text{mL} \). So, 18 gallons is equal to 68,220 mL! When making such conversions, it’s easy to get lost in the math — especially when multiple unit conversions are involved! One common mistake is not converting the units in the correct order; always remember to convert to the larger unit first and then work your way down. For example, if you mistakenly tried to jump straight from gallons to mL without going through liters, you could easily end up with the wrong result. Be sure to keep track of your conversions step by step!