Convert liters & milliliters

This topic focuses on teaching third graders how to convert between the primary metric units of liquid capacity: liters (L) and milliliters (mL). The fundamental concept is understanding and applying the conversion factor: 1 liter equals 1000 milliliters. Students practice converting liters to milliliters, typically by multiplying the number of liters by 1000 (e.g., 3 L = 3000 mL). Conversely, they learn to convert milliliters to liters, usually through division by 1000 or by recognizing groups of one thousand (e.g., 4000 mL = 4 L). These exercises, generally focusing on whole numbers, help students build fluency with metric capacity units and prepare them for solving measurement problems.