Convert 1.25 L to milliliters.

• A. 1,250 mL
• B. 125 mL
• C. 0.125 mL
• D. 12,500 mL

Answer: (A)

Converting units within the metric system relies on the relationship that 1 liter equals 1000 milliliters. To get from liters to milliliters, you multiply by 1000. So, 1.25 liters times 1000 gives 1250 milliliters. The decimal moves three places to the right: 1.25 → 1250, so 1.25 L = 1250 mL.

If you only move the decimal two places, you’d get 125 mL, which is missing a factor of 10. If you moved it the wrong way or misapplied the factor, you could land on 0.125 mL or 12,500 mL, which correspond to much smaller or larger volumes (0.125 mL is far less than a mL, and 12,500 mL is 12.5 L). The correct approach is multiplying by 1000 to convert liters to milliliters.