Which is greater 0.34 L or 430 mL

Again, the simplest way would be to turn the L into mL.

Since there are 1000 mL in a single L (iter), you would want to multiply 0.34 by 1000 to turn it into mL.

0.34 x 1000 = 340 mL.

430 mL is greater.

0.34 L is equal to 340 ml

430 ml is equal to 0.43