Maths has always been a subject that sparks intense debate. While it's a subject that many find challenging, it's also one that can be quite enjoyable, especially when paired with brain teasers ...

The missing number is 1,620. The digits in the tens places (green in the figure below) of the numbers in columns 1, 2, 4 and 5 are added together. The total value is represented by the digits in ...