Is there a reason why the last digits of the squares of the numbers from 1-9 form a palindrome? (149656941) I'm just curious
hello! it's because you can think of 9 as (10-1), 8 as (10-2) and so on. so basically, if numbers 1-4 are "x" then numbers 6-9 are "10-x". and if you expand (10-x)^2, you'll find that it's 10^2-20x+x^2 and so the last digit of (10-x)^2 is just going to be the same as the last digit of x^2. hope that helped.
@genuineopossum to clarify, 9 is supposed to be (10-x) for 1 and 8is supposed to be (10-x) for 2 and so on.