Here’s a brain teaser !.
Can you “build” all the whole numbers between 1 and 100 using only
four 4’s ?
4
and symbol ..
+ - x / ( ) . x^2 =
oh.. and also factorial..
!
i can get the number 9 as 4+4 + 4/4 ,
hehe.
post your calculated in comment.. let’s see if can get up to 100.
Source : Great-International-Math-Keys-Book
p/s : it is from 1970’s ~