mL× 1000 down · ÷ 1000 upL× 1000 down · ÷ 1000 upkL
cm³× 1 000 000 down · ÷ 1 000 000 upm³
1 cm³=1 mL·1 m³=1000 L
Convert this
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Going to a smaller unit you multiply (more of them); going to a bigger unit you divide (fewer of them). And pick the unit that gives a sensible-sized number — a cup in mL, a pool in kL.