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Take any whole number and add the digits down to a single number. Now, subtract this number from the original number. With this answer add the digits down to a single number and it will always end up being 9.
Example: 22 (2+2=4) 22-4=18 (1+8=9)
or
14567 (1+4+5+6+7=23 and 2+3=5) 14567-5=14562 (1+4+5+6+2=18 and 1+8=9)
Why does you always end up with 9 and is there a name for this?
Example: 22 (2+2=4) 22-4=18 (1+8=9)
or
14567 (1+4+5+6+7=23 and 2+3=5) 14567-5=14562 (1+4+5+6+2=18 and 1+8=9)
Why does you always end up with 9 and is there a name for this?