Here's a brain teaser! Can you (with the help of your calculator, as needed) "build" all the whole numbers between 1 and 100 using only four 4's? Use only the + - X / ( ) . ^2 = and 4 keys on your calculator. 4!=4X3X2X1 is allowed, along with repeating decimal 4 (.4~=.4444…), also the number 44 is allowed.

so 4^3 is not allowed.

37: (4!/4)^2+(4/4)

42: (4!/.4~)-4^2+4

43: 44-(4/4)