diff --git a/core/src/main/java/org/nwapw/abacus/Abacus.java b/core/src/main/java/org/nwapw/abacus/Abacus.java
index 113bda8..6d4907d 100644
--- a/core/src/main/java/org/nwapw/abacus/Abacus.java
+++ b/core/src/main/java/org/nwapw/abacus/Abacus.java
@@ -1,7 +1,10 @@
 package org.nwapw.abacus;
 
 import org.nwapw.abacus.config.Configuration;
+import org.nwapw.abacus.number.NaiveNumber;
 import org.nwapw.abacus.number.NumberInterface;
+import org.nwapw.abacus.number.PreciseNumber;
+import org.nwapw.abacus.number.PromotionManager;
 import org.nwapw.abacus.parsing.LexerTokenizer;
 import org.nwapw.abacus.parsing.ShuntingYardParser;
 import org.nwapw.abacus.parsing.TreeBuilder;
@@ -11,6 +14,8 @@ import org.nwapw.abacus.plugin.StandardPlugin;
 import org.nwapw.abacus.tree.NumberReducer;
 import org.nwapw.abacus.tree.TreeNode;
 
+import java.math.BigDecimal;
+
 /**
  * The main calculator class. This is responsible
  * for piecing together all of the components, allowing
@@ -42,6 +47,10 @@ public class Abacus {
      * from a string.
      */
     private TreeBuilder treeBuilder;
+    /**
+     * Promotion manager responsible for the promotion system.
+     */
+    private PromotionManager promotionManager;
 
     /**
      * Creates a new instance of the Abacus calculator.
@@ -55,11 +64,20 @@ public class Abacus {
         LexerTokenizer lexerTokenizer = new LexerTokenizer();
         ShuntingYardParser shuntingYardParser = new ShuntingYardParser();
         treeBuilder = new TreeBuilder<>(lexerTokenizer, shuntingYardParser);
+        promotionManager = new PromotionManager(this);
 
         pluginManager.addListener(shuntingYardParser);
         pluginManager.addListener(lexerTokenizer);
     }
 
+    /**
+     * Gets the promotion manager.
+     * @return the promotion manager.
+     */
+    public PromotionManager getPromotionManager() {
+        return promotionManager;
+    }
+
     /**
      * Gets the current tree builder.
      *