How can one talk without saying a single word?

When 99 is considered higher than 100?

You need to climb ten stairs. At every stair, you can either take one step up or you can jump two steps up.

In how many different ways you can climb 10 stairs?

Can you replace the X (both small and big x) with the numbers between 1 to 19 such that all the rows of 3 numbers between X (big x) sum to 23?

In the image below, can you find the value of an angle(y)

What number when divided in half becomes zero?

You see me once in June, twice in November, and not at all in May. What am I?

An infinite number of mathematicians are standing behind a bar. The first asks the barman for half a pint of beer, the second for a quarter pint, the third an eighth, and so on. How many pints of beer will the barman need to fulfill all mathematicians' wishes?

What goes up but never comes down?

Can you count the number of matches in the picture below ?