In this video, we think about what what mass really means. We also examine the masses of real objects in grams and kilograms.
Arithmetic word problems with mass is a free educational video by Khan Academy.It helps students in grades 3 practice the following standards 3.MD.A.2.
1. 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 cm^3 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. (Excludes multiplicative comparison problems (problems involving notions of "times as much.").