Place exactly three common mathematical symbols

Between the the digits 1 2 3 4 5 6 7 8 9 so the result equals 100. The same symbol can be repeated if you wish, but each repeat count's toward your limit of three. Rearranging the digits is not permitted.

 

do you only include the numbers with symbols between them, or are the numbers that have no symbols simply added to the sum?

 

Ham Sandwiches are yummy.

 

123 - 45 - 67 + 89 =100