This Fluency Activity is a part of the Lesson 18, Unit 1, Grade 4. This fluency activity strengthens understanding of the relationship between kilograms and grams learned in Grade 3, preparing students to use this relationship to solve problems in Module 2, Topic A. Use a number bond to support understanding of the relationship between grams and kilograms. Count by 200 grams starting at 0 grams and counting up to 2,000 grams. When you get to 1,000 grams, say "1 kilogram." When you get to 2,000 grams, say "2 kilograms."