One quarter of a liter equals how many milliliters?

• A. 750 ml
• B. 1000 ml
• C. 250 ml
• D. 500 ml

Answer: (C)

Converting between liters and milliliters is the key idea. A liter equals 1000 milliliters, so a quarter of a liter is one fourth of 1000 ml. 1000 ÷ 4 = 250, so a quarter-liter equals 250 milliliters. The other common values correspond to other fractions of a liter: 750 ml is three quarters, 1000 ml is a full liter, and 500 ml is half a liter. So, 250 milliliters is the correct amount.