diff --git a/src/org/nwapw/abacus/function/Operator.java b/src/org/nwapw/abacus/function/Operator.java
index bd12495..6d6f7ff 100644
--- a/src/org/nwapw/abacus/function/Operator.java
+++ b/src/org/nwapw/abacus/function/Operator.java
@@ -3,7 +3,7 @@ package org.nwapw.abacus.function;
 /**
  * A class that represents a single infix operator.
  */
-public abstract class Operator {
+public class Operator {
 
     /**
      * The associativity of the operator.
diff --git a/src/org/nwapw/abacus/plugin/StandardPlugin.java b/src/org/nwapw/abacus/plugin/StandardPlugin.java
index a864ff6..bd410cd 100755
--- a/src/org/nwapw/abacus/plugin/StandardPlugin.java
+++ b/src/org/nwapw/abacus/plugin/StandardPlugin.java
@@ -1,6 +1,8 @@
 package org.nwapw.abacus.plugin;
 
 import org.nwapw.abacus.function.Function;
+import org.nwapw.abacus.function.Operator;
+import org.nwapw.abacus.function.OperatorAssociativity;
 import org.nwapw.abacus.number.NaiveNumber;
 import org.nwapw.abacus.number.NumberInterface;
 
@@ -21,7 +23,7 @@ public class StandardPlugin extends Plugin {
 
     @Override
     public void onEnable() {
-        registerFunction("+", new Function() {
+        registerOperator("\\+", new Operator(OperatorAssociativity.LEFT, 0, new Function() {
             @Override
             protected boolean matchesParams(NumberInterface[] params) {
                 return params.length >= 1;
@@ -35,9 +37,9 @@ public class StandardPlugin extends Plugin {
                 }
                 return sum;
             }
-        });
+        }));
 
-        registerFunction("-", new Function() {
+        registerOperator("-", new Operator(OperatorAssociativity.LEFT, 0, new Function() {
             @Override
             protected boolean matchesParams(NumberInterface[] params) {
                 return params.length == 2;
@@ -47,9 +49,9 @@ public class StandardPlugin extends Plugin {
             protected NumberInterface applyInternal(NumberInterface[] params) {
                 return params[0].subtract(params[1]);
             }
-        });
+        }));
 
-        registerFunction("*", new Function() {
+        registerOperator("\\*", new Operator(OperatorAssociativity.LEFT, 1, new Function() {
             @Override
             protected boolean matchesParams(NumberInterface[] params) {
                 return params.length >= 1;
@@ -63,9 +65,9 @@ public class StandardPlugin extends Plugin {
                 }
                 return product;
             }
-        });
+        }));
 
-        registerFunction("/", new Function() {
+        registerOperator("/", new Operator(OperatorAssociativity.LEFT, 1, new Function() {
             @Override
             protected boolean matchesParams(NumberInterface[] params) {
                 return params.length == 2;
@@ -75,7 +77,7 @@ public class StandardPlugin extends Plugin {
             protected NumberInterface applyInternal(NumberInterface[] params) {
                 return params[0].divide(params[1]);
             }
-        });
+        }));
 
         registerFunction("!", new Function() {
             //private HashMap<Class<? extends NumberInterface>, ArrayList<NumberInterface>> storedList = new HashMap<Class<? extends NumberInterface>, ArrayList<NumberInterface>>();
diff --git a/src/org/nwapw/abacus/tree/NumberReducer.java b/src/org/nwapw/abacus/tree/NumberReducer.java
index ab80374..6e4bee8 100644
--- a/src/org/nwapw/abacus/tree/NumberReducer.java
+++ b/src/org/nwapw/abacus/tree/NumberReducer.java
@@ -30,7 +30,7 @@ public class NumberReducer implements Reducer<NumberInterface> {
         } else if(node instanceof OpNode){
             NumberInterface left = (NumberInterface) children[0];
             NumberInterface right = (NumberInterface) children[1];
-            Function function = manager.functionFor(((OpNode) node).getOperation());
+            Function function = manager.operatorFor(((OpNode) node).getOperation()).getFunction();
             if(function == null) return null;
             return function.apply(left, right);
         } else if(node instanceof FunctionNode){