RE: 9994 Squared = 99 880 036 - Can you calculate this in your head? - Let me teach you how.

[gikitiki]

This one's new to me.
25 squared
=(20+5)(30-5)
=20(30)-5(20)+5(30)-5(5)
=100(2X3)+5(-20+30)-5(5)
=100(2X3)+5(10)-5(5)
=100(2X3)+5(5)
Amazing.
@jacor Consider yourself followed. :-)

Comments

[jacor]

Thanks @gikitiki :)