We want to square 65. That is, calculate 65 - We first note that the number ends in "5" ...
**that's important!** - We square this second digit. That gives 5*5 =
**25**... which is how our answer ends! - Then we pick the first digit. That's "6".
- We multiply "6" by "7" giving
**42**... which is how our answer begins! Why 7? That's the*"one more than the one before"*, since 7 is one more than 6, eh? - The answer is
**42****25**.
Why?
Note that |