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

Below toothpicks/matchsticks indicate the group of fishes moving from west to east direction. Can you make them move from east to west by just moving three toothpicks/matchsticks?

With pointed fangs I sit and wait; with piercing force I crunch out fate; grabbing victims, proclaiming might; physically joining with a single bite. What am I?

There is a place where if I stand up straight, I will still be considered sideways.

There are 2 people near the river and both of them want to get on the other side. The boat can only take one of them. But they got across.
How?

A Scientist was fifty years old in the year 2000 but he was forty years old in the year 2010. How can this be possible?

PS: It has a logical answer.

They do not possess flesh or feathers or scales or bone
But still, they are blessed with fingers and thumbs of their own.

What building has the most stories?

Something Extraordinary happened on May 6th 19778 at 12:34am what was that?

You are mixing a mixture of cement and Sand with five gallons of water. You have a garden hose giving you all the water you need. The problem is that you only have a four-gallon bucket and a seven-gallon bucket and neither has graduation marks. Find a method to measure five gallons.