Count the number of lines in the image below ?

Count the number of triangles in the picture below:

Can you convert the number zero(0) into a positive number using just one mathematical operator ?

Which number should replace the question mark?

I am an odd number. Take away a letter and I become even. What number am I?

A tree doubled in height each year until it reached its maximum height over the course of ten years. How many years did it take for the tree to reach half its maximum height?

I am the beginning of everything, the end of everywhere. I'm the beginning of eternity, the end of time and space. What am I?

Find the next number in the series below.

6 18 270 72090 ?

What can jump higher than a building?

An equation has been laid down using a few matchsticks. However, as you can see, the equation is not correct. Can you correct the equation if you are allowed to add or remove 5 matchsticks?