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Answer 1 · 2014-04-03T22:56:33

You convert gallons to litres and then to millilitres.

I will use Imperial gallons. (The conversion factor for US gallons is 1 US gal = 3.785 L).

EXAMPLE:

Convert 10.0 gallons to millilitres.

10.0 gal × #(4.546 L)/(1 gal)# = 45.5 L

45.5 L × #(1000 mL)/(1 L)# = 45 500 mL = 4.55 × 10⁴ mL

Notice how we set up the conversion factors to make the units cancel.