Here's a visual students won't easily forget! Relate visually that every gallon has:
Use as a reference to help students answer questions like:
How many pints are in a quart?
How many cups are in a half gallon?
Post in your classroom, or copy on colorful paper for students to keep as a reference.
For a perplexing look at how much various products cost per gallon, please check out my "How Much Per GALLON?" activity!