We'll explore how this shortcut works for both two-digit numbers multiplied by themselves, and even for multiplying two different numbers ending in 5.

This Maths article explains both the mental method and written method for multiplying a 2-digit number by a 1-digit number.

We watched this example of how to multiply two digit numbers, and have been batting 1.000 on every combination. It's hard to say how well the trick holds up to your standard "multiply and carry" ...

Multiplication of two numbers is easy, right? At primary school we learn how to do long multiplication like this: The long way to multiplication. David Harvey Methods similar to this go back thousands ...