what is peculiar with the number nine ( 9 ) ?

Answer 1

Multyply ANY number by 9 and sum of your answer will always be 9 or a multiple of nine.
Example:
587 x 9 = 5,283; 5+2+8+3 = 18; 1 + 8 = 9

You can check an addition problem with a method called casting out nines.
With this method you add every number in the addends till you get a one digit number. Then add those two.
Do the same with the sum. The ending numbers are the same if the addition was done correctly.
When you cast out 9's you first cross out all 9's in each addend and all numbers whose sum is 9. then add the rest and the result will be the same.

_6,726 6+7+2+6 = 21; 2 + 1 = 3
+ 9,238 9+2+3+8 = 22; 2 + 2 = 4 you add 4 + 3 = 7
15,964 1+5+9+6+4 = 25; 2 + 5 = 7

Answer 2

Mulitiply any number from 1-10 by 9 and the sum of the resulting digits will always be 9.

Answer 3

If you take any number (not necessarily a multiple of 9) and swap two of the digis, then subtract one from the other, the difference is always a multiple of nine.

Answer 4

if you write 9x0=, 9x1=, 9x2=, etc up to 9*10= in a column, the answers can be obtained by writing 0-9 after the = proceeding down the column and then writing 0-9 after THAT digit proceeding up the column.

Answer 5

permit the digits interior the quantity be a and b then the quantity is 10a + b 10a + b = 3(a + b) 10a – 3a = 3b – b 7a = 2b a = 2 and b = 7 quantity is 27 in addition try for 3 digit quantity 100a + 10b + c = 3a + 3b +3c ninety seven a + 7b – 2c = 0 ninety seven a = 2c – 7b a = 2c – 7b/ninety seven 2c – 7b is divisible through ninety seven 2c – 7b = ninety seven

Answer 6

seven ate nine

Answer 7

Put it upside down next to each other and it becomes naughty