Author: Andrew Irving and Ebrahim Patel

Why do we add fractions the way we do? A very close look at addition reveals the answer — and it also works for negative numbers.

Learning mathematics involves a progression to higher and higher concepts, building on the foundations of what we have already learnt. But Andrew Irving and Ebrahim Patel explain that no matter how high your mathematical knowledge reaches you must never lose sight of your foundations, no matter how basic they may seem.