Deletion of Mental Multiplication of Integers ending with 5

Comment: Wikipedia is |not a guide and it's not for |original research
Stance: delete
Cited policy: Wikipedia:What Wikipedia is not (WP:NOTGUIDE||WP:OR)

Comment: Also |unsourced and looks like |original research
Stance: delete
Cited policy: Wikipedia:Verifiability (WP:V||WP:NOR)

Comment: per #HOWTO and not notable
Stance: delete
Cited policy: Wikipedia:What Wikipedia is not (WP:NOT)

Comment: per #HOWTO - this is for a textbook, not an encyclopedia
Stance: delete
Cited policy: Wikipedia:What Wikipedia is not (WP:NOT)