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?

What does the following represent?

N N N N N N N

A A A A A A A

C C C C C C C

What is the next number in this matchsticks series riddle?

You are provided with a grid (as shown in the picture). Can you fill the squares with numbers 1-8 in a manner that none of the two consecutive numbers are placed next to each other in any direction (vertically, horizontally or diagonally?)

If there are fifteen crows on a fence and the farmer shoots a third of them, how many crows are left?

What number divided by 4 is the same as that number minus 4?

Find out a multi-digit number that if multiplied by the number 9 or any of its multiplications products (i.e. 18, 27, 36, 45,..) will result in the multiplication factor repeated (n) number of times.

One day, John and his friends were playing around. Jacob hit something with a Pin and it popped. John's dad came into the room that very moment, but he wasn't mad. In fact, he was smiling. What did Jacob hit?

I never stop running even when I standstill. If I am formed by joining two identical bodies together, can you guess who I am?

The square root of number 121 is "11". What is the square root of the number "12345678987654321."?