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

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

What does below chemistry rebus means?

I have a hole in my back and legs I lack.
I live where I can’t breathe and I eat without teeth.
What am I?

You can take four of the five letters out of this word, but the pronunciation never changes. What is the word?

Once upon a time, there was a castle on a square island. The entire island was surrounded by a 14m wide trench. The Romans had wanted to invade the castle and had brought a few wooden planks along with them to facilitate themselves in crossing the moat. The planks were however found to be only 13m long.

The Romans still managed to cross the trench. How did they do it?

Mr Red Lives in the red house.
Mr Green Lives in the greenhouse.
Mr Yellow Lives in the yellow house.

Who lives in the Whitehouse?

My first is in chocolate but not in ham. My second is in cake and also in jam. My third at tea time is easily found. Altogether, this is a friend who is often around. What is it?

Can you solve the tricky chess rebus puzzle below by ciphering the hidden meaning?

The husband and wife were jogging in the morning. To match every two steps of the husband, the wife required three steps. If Both of them start with the here right foot. After how many steps do their left foot be together?