Sherlock Holmes was challenged to make a pre-drawn line smaller without erasing it. He did it in fractions of seconds. How?

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

What mathematical symbol can be put between 5 and 9, to get a number bigger than 5 and smaller than 9?

What jumps when it walks and sits when it stands?

When I got four, I have it none.
When I got two, I have it some.
When I got none, I have it all.

What is it?

Which is the rope you never skip with?

81 x 9 = 801. What must you do to make the this equation true?

Four cars come to a four-way stop, each coming from a different direction. They can’t decide who got there first, so they all go forward at the same time. All 4 cars go, but none crash into each other. How is this possible?

Two in a corner, one in a room, zero in a house, but one in a shelter. What is it?

In a fruit store, there was a unique weighing machine that was made to weigh only cherries and strawberries as they were priced the same.

Other fruits like watermelons or mango had different machines as they were expensive.

A man successfully buys watermelons at the price of cherries. How?