This learning resource focuses on understanding the milli- prefix in the context of place value in decimal numbers. It is structured into three parts, encouraging students to reflect on their prior knowledge about place value, apply the milli- prefix to a practical example (a medicine dropper), and articulate their understanding of how the prefix defines the relationship between whole and fractional liters. Students engage in personal reflection, numerical application, and explanatory writing, fostering a deeper grasp of decimal values. The exit ticket format allows for self-assessment of growth in mathematical concepts related to place value and decimal representation.