[From the notes of Emily Moore, with modifications by Samuel A. Rebelsky.]
Using mathematical symbols to combine four fours it is possible to write expressions for all the numbers from 0 to 100, as well as millions of others. For example,
2 = 4/4 + 4/4
.
3 = (4+4+4)/4
.
64 = (4+4) * (4+4)
.
Using any symbols that do not themselves contain digits, see how many numbers you can form using four fours. Some should be easy. Some people find these numbers particularly difficult: 13, 19, 33, 85.
Source text last modified Tue May 5 08:49:56 1998.
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