Learn a clever way to multiply two digit numbers and make these calculations faster and easier ...

Olivia shares a simple multiplication trick that makes two digit multiplication easier when the numbers end in 1.

19 is only 1 away from 20, so you prefer to start by multiplying 20 times 5, which equals 100. Then we need to take away a squadron of 5, because there are actually only 19 squadrons, not 20. 100 take ...

There are 19 squadrons with 5 ships in each squadron. It looks like an attack force! Better call the space station and let them know. But how many ships are there ...

Forget your times tables – mathematicians have found a new, faster way to multiply two numbers together. The method, which works only for whole numbers, is a landmark result in computer science. “This ...