@@ -0,0 +1,232 @@
+package org.nwapw.abacus.number;%0A%0Apublic interface Number %7B%0A%0A    Number multiply(Number multiplier);%0A    Number divide(Number divisor);%0A    Number add(Number summand);%0A    Number subtract(Number subtrahend);%0A    Number negate();%0A%0A%7D%0A

Create Number interface.