Question

Which of the following is the smallest volume?
5600 mL
250 cm3
3.0 x 10-2 L
25 m3

Answer 1

3.0 x 10-2 L is the smallest :)

Answer 2

To approach a problem like this, you should convert each measurement to a single unit.

In this case, I'd probably use cm3:
To convert mL to cm3... you can just change the unit, because 1cm3=1mL
Converting m3 to cm3 shouldn't be that difficult. If you imagine a cubic meter, it is 100cm on each side, so is equal to 100x100x100cm3
3.0x(10^-2) L is probably the trickiest. First try converting it out of scientific notation, and then converting from L to mL should be a cinch!

Once they're all in the same unit, it's easy to see which is the smallest.