Question

- how is this possible ?

1×8 +1 =9
12×8 +2 =98
123×8 +3 =987
1234×8 +4 =9876
12345×8 +5 =98765
123456×8 +6 =987654
1234567×8 +7 =9876543
12345678×8 +8 =98765432
123456789×8 +9 =987654321

Answer 1

ooo lalala a pyramid

Answer 2

Interesting.

Answer 3

can be this realized using different number in place of 8 or just in this way is possible ?

Answer 4

@TheSmartOne

Answer 5

I noticed we can write this, to take a specific example:

\[1234560-123456+6=1111110\]\[123456*(10-1)+6=1111110\]\[123456*9+6=1111110\]\[123456*8+6=1111110-123456\]\[123456*8+6=987654\]

The main two things I see going on are we have this relationship here which isn't too hard to see:
\[123456+987654=1111110\]
And the other relationship we have it \(9=10-1\) which is what allows us to put the numbers next to each other so that we get the digits to line up like 9-8=1, 8-7=1, 7-6=1, etc...

Hopefully this helps in trying to find some other kinds of patterns like this!