12 cakes cost 65p.
For 24 cakes, double the cost is £1.30.
For 36 cakes, the cost of 12 cakes multiplied by 3 is £1.95.
For 6 cakes, half the cost is not 32.5p, since we no longer have half pence in the UK. The cost is therefore 33p.
For the ingredients:
Ingredients
12 cakes
24 cakes
36 cakes
6 cakes
1 cake
Caster sugar
130g
260g
390g
65g
10.8g
Margarine
130g
260g
390g
65g
10.8g
Self raising flour
130g
260g
390g
65g
10.8g
Eggs
2
4
6
1
1/3
Baking powder (5ml spoons)
1
2
3
1/2
1/12
To scale the recipe for other numbers of cakes which are not a simple multiple of 12 or 6, you will need to find the cost of 1 cake and the amount of ingredients required for 1 cake. Then multiply by the number of cakes required, rounding your answers sensibly and remembering that eggs come in whole numbers! (Professional kitchens weigh the eggs, rather than using whole numbers of
eggs.)
If you are using the provided arrows, these facts may help you:
use x2 (doubling) arrows going from 6 cakes to 12 and from 12 cakes to 24
use divide by 2 or multiply by 1/2 (halving, same thing as division and multiplication are inverse processes,and 1/2 is the inverse of 2) arrows for 12 cakes to 6 or 24 cakes to 12
use x 1.5 or x3/2 or half as much again cards going from 24 cakes to 36
use divide by 1.5 or x2/3 cards going from 36 cards to 24