If it weren't obvious from my writing and physique, you should know that I love food. And there aren't many foods I love more than pizza. Indeed, on a recent trip to Italy, I visited my favourite pizzerias.

Pizzeria Spera, Florence

Pizzeria Capri, Perugia

Pizzeria Mediterraneo, Perugia

Pizzeria Sorbillo, Napoli
With such a strong spiritual bond, I find the pizza an excellent source of analogy. However, I can't go past Leon Krier, the Luxembourg urban design critic, who likens the absurdity of suburban zoning, where residential is separated from commerce, education and office areas, to the absurdity of eating a pizza - one ingredient at a time. First you eat the cheese, then the tomato, then the anchovies...

Sometimes I see the division of learning into compartments (science, maths, english, history, etc etc) in a similar way. The pizza tastes better when all the ingredients are with all the other ingredients, and eating the ingredients separately seems contrived. It seems particularly so in maths; fortunately, there are many opportunities to integrate mathematical skills and ways of working into broader contexts.
I've always thought Scratch represents many opportunities for transdisciplinary learning. Currently I am working with maths teachers who are striving to use the engaging project of creating their own computer game to explicitly teach mathematics. So far, we have identified x-y coordinates, angles, algebra, chance (through the random number function), and basic functions such as addition, subtraction, multiplication and division as all concepts that are fundamental to creating a computer game using Scratch.
We're beginning with the teaching of using the x-y coordinates to describe the location of a point. For this, using the x-y grid background can provide an aide to transferring knowledge taught explicitly to the students' own computer games.

So our task this week is to make a simple game based on x-y coordinates: a simple game where you get a point for clicking on a fast-moving object that moves to a random position every second. Can you limit the movement of the object to a particular quadrant?
Hopefully, by linking the understanding of how an x-y coordinate can identify the position of a point on a two-dimensional plane (abstract) to the creation of a computer game (tangible), the common lament of students, "when are we ever going to use this" will be answered. And our pizza might just be tastier.
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