Puzzle Types

THE DIGITAL CENTURY.

(Money Puzzles)
1 2 3 4 5 6 7 8 9 = 100.
It is required to place arithmetical signs between the nine figures so
that they shall equal 100. Of course, you must not alter the present
numerical arrangement of the figures. Can you give a correct solution
that employs (1) the fewest possible signs, and (2) the fewest possible
separate strokes or dots of the pen? That is, it is necessary to use as
few signs as possible, and those signs should be of the simplest form.
The signs of addition and multiplication (+ and x) will thus count as
two strokes, the sign of subtraction (-) as one stroke, the sign of
division (/) as three, and so on.


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