First, students will learn how to convert liters to milliliters.
Convert liters to milliliters by Khan Academy
Convert to smaller units (mL and L) by Khan Academy
Next, students will learn how to convert larger US customary units of volume to smaller ones. Units of volume will include cups, pints, quarts, and gallons.
Converting US customary units of volume by Khan Academy
Convert to smaller units (c, pt, qt, & gal) by Khan Academy
Conclude by leading this investigation:
4.MD.A.1: Know relative sizes of measurement units within one system of units including km, m, cm; kg, g; lb, oz.; l, ml; hr, min, sec. Within a single system of measurement, express measurements in a larger unit in terms of a smaller unit. Record measurement equivalents in a two-column table. For example, know that 1 ft is 12 times as long as 1 in. Express the length of a 4 ft snake as 48 in. Generate a conversion table for feet and inches listing the number pairs (1, 12), (2, 24), (3, 36), ...