Arithmetic Symbols

<<

 +   - 
 x   ÷ 


+  French philosopher Nicole Oresme, 1360.
-  German mathematician Johannes Widmann, 1489.
x  English mathematician William Oughtred, 1631.
÷  Swiss mathematician Johann Rahn, 1659.

Modern Arithmatic Symbols

 +    -  
 ∗   /