3.MD.A.2

Measure and estimate liquid volumes and masses of objects using standard units of grams (g), kilograms (kg), and liters (l). Excludes compound units such as cm3 and finding the geometric volume of a container. Add, subtract, multiply, or divide to solve one-step word problems involving masses or volumes that are given in the same units, e.g., by using drawings (such as a beaker with a measurement scale) to represent the problem.

Estimate volumes in milliliters and liters. For example, what’s more appropriate for measuring a swimming pool, milliliters, or liters? Esimate mass in grams and kilograms. For example, which is closest to the mass of an ant, 1 gram, or 100 grams? Conclude by giving your students this challenge.