A trick for mentally calculating squares of two digit numbers (via bilibili):
Basically, choose such that either or is a multiple of 10, then use
Example:
For 26, the closest multiple of 10 is 30, so
;
This algorithm can be extended recursively for squares of n digit numbers, though it is seems less useful.
A trick for mentally calculating squares of two digit numbers (via bilibili):
Basically, choose
Example:
For 26, the closest multiple of 10 is 30, so
This algorithm can be extended recursively for squares of n digit numbers, though it is seems less useful.