Use only one mathematical symbol and all numbers (0-9) to get a sum of 99

Use the digits from 1 up to 9 and make 100.

Follow the rules.
=> Each digit should be used only once.
=> You can only use addition.
=> For making a number, two single digits can be combined (for example, 4 and 2 can be combined to form 42 or 24)
=> A fraction can also be made by combining the two single digits (for example, 4 and 2 can be combined to form 4/2 or 2/4)

Question: how can we do this?

There are seven sisters in a house in a village where there is no electricity or any gadget.

Sister-1: Reading Novel
Sister-2: Cooking
Sister-3: Playing Chess
Sister-4: Playing Sudoku
Sister-5: Washing clothes
Sister-6: Gardening

what is Sister-7 doing ?

What has many teeth, but cannot bite?

A man says, "Brothers and sisters, have I none, but that man's father is my father's son." Who is that man?

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

In the picture given below, can you find out which digit will take place of the question mark?

What's a single-digit number with no value?

I am a mother. However, I never give birth.

I am a father. However, I never nurse my children.

Wandering is not possible for me, but standing still happens occurs rarely.

Who am I?

Can you count the number of triangles inside a triangle?