Smoothie Lab

Hook 5 min

1. Make 4 scoops of strawberry and 6 of banana. Press Blend and taste. That's batch 1.
2. "I want a smaller batch that tastes exactly the same. How many scoops of each?" Take guesses.

Explore 13 min

1. Make 2 strawberry and 3 banana, and blend. The owner says it tastes exactly like batch 1, and the log marks it "= #1."
2. Pairs try other recipes and predict which will taste the same as batch 1. They blend to check.
3. Pairs look at the graph. "Where do the equal-tasting recipes land?" (On one straight line through 0.)
4. Ask: "The layers in the jug are each one scoop. What fraction of the smoothie is strawberry?"

Make sense 10 min

1. "Why do 4 : 6 and 2 : 3 taste the same?" (Both parts were divided by 2.)
2. Build a ratio table on the board: 2 : 3, 4 : 6, 6 : 9, 8 : 12. "What do you multiply by to get each row?"
3. Find the unit rate: "How many scoops of banana for 1 scoop of strawberry?" (1.5.)
4. "Why do all the equal-tasting recipes sit on a straight line that starts at 0?"

Apply 12 min

1. Pairs switch to Orders. Each order asks for a recipe plus one condition: scale up, fill to a total, simplest form, a percent, a unit rate.
2. Every try lands on the graph: red tastes wrong, gold tastes right but misses the condition, green fills the order.
3. "What did you multiply by? How do you know?"

Exit check 5 min

On a card: "A smoothie uses 3 scoops of mango for every 5 of yogurt. Make a ratio table with three rows. How much mango for 20 scoops of yogurt? What is the unit rate of yogurt per scoop of mango?"