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 ...

Space to play or pause, M to mute, left and right arrows to seek, up and down arrows for volume. It's called the Gelosia method and it uses a crosshatch, or lattice template, to multiply large numbers ...

You can solve a lot of multiplication calculations by working things out in your head. Knowing your times table facts is a great way to multiply smaller numbers in your head. However, there are also ...