Subtraction is when you take away a number or an amount from another number or amount to work out what is left. There are different things you can use to help you subtract. You can use number ...

Numbers can be subtracted using the column method. Watch this video to learn about subtracting 4-digit numbers using the column method. When using a place value column to subtract two large ...

Percy Liang at Stanford. The last player to move the "rock" into the end position wins the game. This can be modelled as a subtraction game - assume we start with a number 25 and either player can ...