Milkshake Math worksheet with the recipe.  As you can see, each batch makes four milkshakes. One batch includes:

  • ¾ cup strawberries (fresh or frozen)
  • ½ cup cashews (must be unsalted, can be roasted or raw)
  • ¾ teaspoon sugar
  • 1 ¼ teaspoon vanilla extract
  • 2 ½ cups milk or non-dairy alternative

Teaching Tip

I recommend laying down some pretty strict ground rules so that the lesson will be a success, especially when there is food involved.  I find that if the kids know they get to have a treat in the end, they will be on board.  Here are the rules I use in my class:

  1. Eat only when instructed to.
  2. Food that touches the desk or the ground goes directly into the garbage.
  3. Do not share or switch food with other students.
  4. Follow directions so that food is not contaminated.
  5. Wear your gloves at all times.

Safety Rules

There are also some safety rules to keep in mind when using food.  Be sure you know each students’ health status and are aware of any allergies.  Stay clear of those foods that are a risk. There are plenty of foods that are safe for kids who have allergies.  I used this recipe. The cashews can be eliminated if students are allergic.

Multiplying Fractions by a Whole Number Milkshake Math Worksheet

Each group will use the recipe on the Milkshake Math Worksheet to answer the questions and find out how much of each ingredient is needed to make a milkshake for everyone in the class.  Before you make the milkshake, each student must do the math.  Let them work through problems in a group to reduce the pressure of getting all correct answers on their own.  Refer them to your examples on the board if they need help.  Circulate around the room asking questions and helping groups that are stuck.

Download and Print These Worksheets:

Milkshake Math Worksheet (PDF)

Milkshake Math Worksheet (Doc)

Have one student from each group go to the board and show their math work for how they figured out the total amount for one of the ingredients.

Have the students choose one person from their group to get a pair of gloves and come forward to add that ingredient, using their worksheet to inform how much they need.  Oversee these students to be sure they are adding the correct amount.  If your blender is not big enough to make enough for the whole class, you may need to do half the class at a time – a whole other level of using fractions! 

Reflecting on the Activity: Multiplying Fractions by a Whole Number

How fun was this lesson?!  As they are all enjoying their milkshakes, you can talk about food that they have had at parties.  How much is there?  Has the host of a party you’ve been to ever run out of food?  Why did that happen?  How can you tell how many servings are in a package of something? How can you avoid this problem at a party?

On a smaller scale, have them think about how many people are in their families.  If they were following a recipe for their family would they have to double it?  Halve it?  What happens if you run out of food at a meal?

Extensions/Next Steps

This is a great chance to talk about food labels.  You can look at how many servings there are in a package.  And how much of each ingredient there might be.  For example, ¼ teaspoon of sugar is one gram.  You can see how many grams of sugar there in foods.  Add this amount of sugar to a baggie, and kids are amazed at how much sugar they eat!

Extra Resources

FREE Multiplying Fractions by a Whole Number Worksheets PDF and Resources

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