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Recipe Ratio Scaling

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Recipe Ratio Scaling

Use equivalent ratios to scale recipes. Show your calculations where asked, and write units with your answers.

Ratios and metric measures

1.In a recipe, what does the ratio 2 cups of oats to 3 cups of milk describe?

How the quantities of oats and milk compare
The total cooking time
The temperature of the oven
The number of bowls needed

2.A batch of muffins serves 5 people and uses 250 g of flour. Write the ratio of flour in grams to people served in simplest form.

3.A soup recipe serves 4. What is the scale factor needed to make enough for 10 people?

4.Convert each amount: 1,800 mL to litres; 3.2 kg to grams; 640 g to kilograms; and 0.6 L to millilitres.

5.Match each ingredient to the most suitable metric unit: a pinch of salt; milk for a family-sized recipe; a large sack of flour; a small amount of lemon juice.

A pinch of salt
Milk for a family-sized recipe
A large sack of flour
A small amount of lemon juice

Kilograms (kg)
Grams (g)
Millilitres (mL)
Litres (L)

Scale a biscuit recipe

The recipe below makes 4 servings. Use the ingredient amounts shown as your starting quantities.

Ingredient

Amount

Plain flour

280 g

Butter

120 g

Brown sugar

90 g

Eggs

Chocolate pieces

160 g

Vanilla essence

4 mL

6.Using the biscuit recipe for 4 servings, calculate the scale factor for 6 servings, then find the required amounts of flour, butter, brown sugar, eggs, chocolate pieces and vanilla essence.

7.Using the biscuit recipe for 4 servings, how much of each ingredient is needed for 10 servings? Include the scale factor and all six ingredient amounts.

Reasoning with recipe ratios

8.A pancake mixture serves 6 people and uses 2 eggs. How many eggs are needed to make the same mixture for 15 people?

9.When a recipe is enlarged but the ingredient ratios are not kept the same, which outcomes are possible? Select all that apply.

The flavour balance may change
The mixture may become too dry or too wet
The result may not turn out as intended
The cooking result is guaranteed to stay identical

10.A scone recipe serves 8 people and needs 600 g of flour. If you have 450 g of flour and scale every ingredient in the same proportion, how many people can you serve? Show how you know.

11.A drink mix uses 3 parts apple juice for every 2 parts water. If you pour in 450 mL of apple juice, how much water gives the same flavour ratio?

12.A granola recipe uses 4 cups of oats and 3 cups of seeds. How many cups of seeds should be used with 10 cups of oats to keep the ratio unchanged?

13.A recipe for 12 scones uses 360 g of cheese. How many grams of cheese are needed for 5 scones at the same rate?