Mental “tricks”

[ChrissyRyan]

Pick a whole number from 1 to 10, then multiply that number by 9.
Sum the two digits from that answer and subtract 5.

Example:  You picked 7.  Multiply 7 by 9.  The answer is 63.  Add the two digits of the answer, 63, and you get 6+3 = 9.   ( This sum will always be 9.)    Subtract 5 from 9 and you get 4.

It does not matter what whole number you picked in that range of 1 through 10. 

You will always end up with the final number of 4.

[Lori Dee ✅]

I wrote a book once about the number nine. It has some interesting properties.
If you list the multiples of nine, the tens column counts up to nine, and the ones column counts down to zero.

[Devlyn ✅]

🎵 Number nine number nine number nine 🎵

[ChrissyRyan]

Multiply your age in years by 7.
Multiply 1443 by that answer.
Now what do you notice?  Your age will appear three times in a row.


For example if you are 20, this is the result:

20 x 7 = 140

1443  x  140  =  202020