This lesson plan compares mass in grams and kilograms for second grade students. Students will measure and compare the mass of different food items and objects using a weighing scale. They will practice using symbols like >, <, and = to compare masses written in grams and kilograms. For example, students will compare whether 500 grams is greater than, less than, or equal to 3 kilograms. The lesson incorporates group work, games, and differentiated instruction strategies. It assesses students' understanding through an activity of writing the correct symbols to compare given masses.