By including only four matchsticks in below picture, you have to make "Four Triangles And Two Squares"

I am under you when I am whole.
I shift above you if you remove the first letter.
I come all around you if you remove the second as well.

Can you tell me who I am?

There are are five things wrong with this sentence; only geniuses will be able to to spot all of the mitstakes

Replace the question mark with the correct number in below Picture:

f you were running a race, and you passed the person in 2nd place, what place would you be in now?

The answer I give is yes, but what I mean is no. What was the question?

what one word does the below rebus identifies?

A number with an interesting property:

When I divide it by 2, the remainder is 1.
When I divide it by 3, the remainder is 2.
When I divide it by 4, the remainder is 3.
When I divide it by 5, the remainder is 4.
When I divide it by 6, the remainder is 5.
When I divide it by 7, the remainder is 6.
When I divide it by 8, the remainder is 7.
When I divide it by 9, the remainder is 8.
When I divide it by 10, the remainder is 9.

It's not a small number, but it's not really big, either.
When I looked for a smaller number with this property I couldn't find one.

Can you find it?

Can you count the number of quadrilaterals in the picture below?

In the image below, can you find the value of an angle(y)