Buy (or make) some chocolate of various 3D shapes (e.g. a block of Cadbury chocolate is a cuboid, a Toblerone is a triangular prism) and record the properties of these 3D shapes e.g. number of faces and vertices.
Bake a chocolate cake! And as you combine the ingredients think about ratios. Can you list ratios of your ingredients? Example: how many parts flour to sugar? The following link may help:
When you are cutting your cake try and cut it into equal proportions and think about fractions; as you and others eat the cake calculate what percentage of the cake has been eaten.
After you have created your menu from the English activity, decide on how much each item on your menu should cost. Take into consideration the cost of ingredients and that if you were running a restaurant what the overheads would be (rent, staff etc.) and of course that you still need to make a profit!
Visit a supermarket and take a look at the confectionery section. Paying attention to the price tags, search for the information that tells you how much you are paying per 100g. Write this down for 10 different chocolate products and then list the products in order of the best value for money to the most expensive (ascending order).
Create a maths activity for younger children. The aim of the activity is to assist them with their number bonds. The theme of the lesson is chocolate! (E.g. smarties/buttons could be the resources for the activity!)