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Cooking Maths

Maths hiding in cooking: doubling a recipe

Scale ingredients for twice as many people using equal groups and repeated addition.

Quick answer

When you double a recipe, you multiply all the ingredients by 2. This is a great way to practice multiplication using equal groups and repeated addition.

Learning outcome

By the end of this page, you will be able to double any recipe using multiplication and repeated addition. Success signs:
  • You can explain what "doubling" means in cooking
  • You can multiply ingredients by 2 using equal groups
  • You can add up doubled ingredients using repeated addition
  • You can check your work to make sure you haven't made a mistake

Why this matters

Cooking maths is everywhere! When you double a recipe, you're using multiplication and addition to make sure you have enough food for more people. This is useful for:
  • Hosting a party
  • Sharing food with family
  • Planning for a bigger group
  • Learning how to scale up any recipe
You'll use this skill in games, cooking, and everyday life. It's like being a maths detective in the kitchen!

How it works

Doubling a recipe means making twice as much food. Here's how to do it step by step:
  1. Look at the original recipe - Find all the ingredients and how much of each you need
  2. Find the number of each ingredient - Write down how much you need for one batch
  3. Multiply each amount by 2 - This is the same as adding the amount twice
  4. Add up the doubled ingredients - Use repeated addition to check your work
  5. Check your answers - Make sure everything makes sense

Examples you can see

Let's imagine you're making a simple pizza recipe that serves 4 people:
Original Recipe (Serves 4) Doubled Recipe (Serves 8)
2 cups flour 4 cups flour
1 cup cheese 2 cups cheese
3 tomatoes 6 tomatoes
1 egg 2 eggs
4 tablespoons oil 8 tablespoons oil
How to double each ingredient:
  • 2 cups flour × 2 = 4 cups flour
  • 1 cup cheese × 2 = 2 cups cheese
  • 3 tomatoes × 2 = 6 tomatoes
  • 1 egg × 2 = 2 eggs
  • 4 tablespoons oil × 2 = 8 tablespoons oil
Using repeated addition:
  • 2 + 2 = 4 cups flour
  • 1 + 1 = 2 cups cheese
  • 3 + 3 = 6 tomatoes
  • 1 + 1 = 2 eggs
  • 4 + 4 = 8 tablespoons oil

Try it as a mini adventure

Adventure: The Great Recipe Rescue You're helping your family cook for a big birthday party! You need to double the recipe for the chocolate chip cookies so there are enough for 12 people instead of 6.
  1. Original recipe: 3 cups flour, 2 eggs, 1 cup sugar, 1 cup butter, 2 cups chocolate chips
  2. Step 1: What is 3 × 2?
  3. Step 2: What is 2 × 2?
  4. Step 3: What is 1 × 2?
  5. Step 4: What is 1 × 2?
  6. Step 5: What is 2 × 2?
  7. Step 6: Add up all your doubled ingredients using repeated addition
  8. Step 7: Check if your answers make sense for 12 people

Common mistakes

  • Mistake: Forgetting to double some ingredients
    Why it happens: When you're excited to cook, you might skip one or two ingredients
    Fix: Make a checklist of all ingredients before doubling
  • Mistake: Mixing up the numbers when multiplying
    Why it happens: It's easy to get confused when you're adding up many numbers
    Fix: Write each multiplication step down and double-check
  • Mistake: Thinking that doubling means adding 2 to each number
    Why it happens: This is a common misunderstanding of "double"
    Fix: Remember that doubling means multiplying by 2, not adding 2
  • Mistake: Not checking your work
    Why it happens: You might rush to get started cooking
    Fix: Always double-check your calculations before you start cooking

Parent and carer guide

Helping your child with doubling recipes
  1. Start simple - Begin with a simple recipe like pancakes or cookies that has just a few ingredients
  2. Use real ingredients - Let your child measure and mix the doubled amounts
  3. Count together - Practice counting and adding the ingredients
  4. Ask questions - "What happens when we double 3 cups?" "How many eggs do we need?"
  5. Check together - Go through each calculation to make sure it's correct
  6. Be patient - It's okay if they make mistakes - that's how we learn!
  7. Make it fun - Turn it into a game or challenge
  8. Keep it safe - Supervise when using knives or the stove
  9. Review - After cooking, talk about what they learned
  10. Encourage - Celebrate their success and learning!

Practice questions

  1. Original recipe: 2 cups flour, 1 egg, 3 tablespoons sugar. What are the doubled amounts?
    Answer: 4 cups flour, 2 eggs, 6 tablespoons sugar
  2. Original recipe: 4 tomatoes, 2 cups cheese, 1 cup milk. What are the doubled amounts?
    Answer: 8 tomatoes, 4 cups cheese, 2 cups milk
  3. Original recipe: 1 cup butter, 2 tablespoons oil, 3 cups flour. What are the doubled amounts?
    Answer: 2 cups butter, 4 tablespoons oil, 6 cups flour
  4. Original recipe: 5 eggs, 1 cup sugar, 2 cups chocolate chips. What are the doubled amounts?
    Answer: 10 eggs, 2 cups sugar, 4 cups chocolate chips
  5. Original recipe: 3 cups rice, 1 cup beans, 2 tablespoons salt. What are the doubled amounts?
    Answer: 6 cups rice, 2 cups beans, 4 tablespoons salt

FAQ

What does it mean to double a recipe?

It means making twice as much food. You multiply each ingredient by 2.

How do I double ingredients in a recipe?

Multiply each ingredient amount by 2. For example, 3 cups becomes 6 cups.

Can I double a recipe with fractions?

Yes! For example, 1/2 cup doubled is 1 cup. 2/3 cup doubled is 4/3 cups.

Why is doubling recipes useful?

It helps you make enough food for more people, like for parties or family gatherings.

What if I want to make 3 times the recipe?

Then you multiply each ingredient by 3 instead of 2. This is called tripling.