When I get multiplied by any number, the sum of the figures in the product is always me. What am I?

A finger goes in me. You fiddle with me when you're bored. The best man always has me first. What am I?

Can you place three balls such that the equation shown in the picture holds true?

P is the father of Q and S is the son of R. T is the brother of P and has a daughter U. If R is the sister of P, then what is the relation between U, Q and S?

In which direction should the missing arrow point?

Take away the whole and some still remain. What is it?

Can you solve this picture maths equation?

I am the largest in my family of fifty.
The youngest of our family lives separately from the rest of the family and so do I.
I am regarded as harsh and tough.
I am so large, you cut me in two equal halves,
each half would still be larger than the second largest member of the family.
Who am I?

The day after tomorrow will be three days before Tuesday. Can you find out what is today?

The more of this there is, the less you see. What is it?