In a mythical temple full of obstacles, Olivia and Hassan learn simple mental maths and apply it to work out the passcode to open the door.

👉 Learn how to add or subtract two functions. Given two functions, say f(x) and g(x), to add (f+g)(x) or f(x) + g(x) or to ...

In this video I work through four different ways you can look at subtracting two functions. Do you like to write the problem ...

Learn how column addition can be used to make adding numbers easier. Subtracting 2-digit numbers Find out how number columns allow you to take large numbers and subtract one from another. How to add ...