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

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

You are provided with a grid (as shown in the picture). Can you fill the squares with numbers 1-8 in a manner that none of the two consecutive numbers are placed next to each other in any direction (vertically, horizontally or diagonally?)

Can you count the number of squares in the given picture?

Double it and multiply it by 4. Then divide it by 8 and you’ll have it once more. What number is it?

Whats the next number in the below number sequence pattern.

If nine thousand, nine hundred nine dollars is written as $9,909,
how should twelve thousand, twelve hundred twelve dollars be written?

Three men in a cafe order a meal the total cost of which is $15. They each contribute $5. The waiter takes the money to the chef who recognises the three as friends and asks the waiter to return $5 to the men.

The waiter is not only poor at mathematics but dishonest and instead of going to the trouble of splitting the $5 between the three he simply gives them $1 each and pockets the remaining $2 for himself.

Now, each of the men effectively paid $4, the total paid is therefore $12. Add the $2 in the waiters pocket and this comes to $14. Where has the other $1 gone from the original $15?

Is the statement valid that it does not matter how much older a sibling is, eventually the younger one will be half as old as the older one?

Teacher ask the student

'Why are you standing on that chair in music class ?'.

what did student replied ?