diff --git a/src/core/operations/baseClasses/Arithmetic.mjs b/src/core/lib/Arithmetic.mjs
similarity index 99%
rename from src/core/operations/baseClasses/Arithmetic.mjs
rename to src/core/lib/Arithmetic.mjs
index 37905362..7171c184 100644
--- a/src/core/operations/baseClasses/Arithmetic.mjs
+++ b/src/core/lib/Arithmetic.mjs
@@ -4,7 +4,7 @@
  * @license Apache-2.0
  */
 
-import Utils from "../../Utils";
+import Utils from "../Utils";
 import BigNumber from "bignumber.js";
 
 /**
diff --git a/src/core/operations/Multiply.mjs b/src/core/operations/Multiply.mjs
new file mode 100644
index 00000000..701beb43
--- /dev/null
+++ b/src/core/operations/Multiply.mjs
@@ -0,0 +1,48 @@
+/**
+ * @author d98762625 [d98762625@gmail.com]
+ * @copyright Crown Copyright 2018
+ * @license Apache-2.0
+ */
+
+import Operation from "../Operation";
+import Arithmetic from "../lib/Arithmetic";
+import BigNumber from "bignumber.js";
+
+/**
+ * Multiply operation
+ */
+class Multiply extends Operation {
+
+    /**
+     * Multiply constructor
+     */
+    constructor() {
+        super();
+
+        this.name = "Multiply";
+        this.module = "Default";
+        this.description = "Multiplies a list of numbers. If an item in the string is not a number it is excluded from the list.<br><br>e.g. <code>0x0a 8 .5</code> becomes <code>40</code>";
+        this.inputType = "string";
+        this.outputType = "BigNumber";
+        this.args = [
+            {
+                "name": "Delimiter",
+                "type": "option",
+                "value": Arithmetic.DELIM_OPTIONS,
+            }
+        ];
+    }
+
+    /**
+     * @param {string} input
+     * @param {Object[]} args
+     * @returns {BigNumber}
+     */
+    run(input, args) {
+        const val = Arithmetic._multi(Arithmetic._createNumArray(input, args[0]));
+        return val instanceof BigNumber ? val : new BigNumber(NaN);
+    }
+
+}
+
+export default Multiply;
diff --git a/src/core/operations/Subtract.mjs b/src/core/operations/Subtract.mjs
index 16d07e67..f0b24ee5 100644
--- a/src/core/operations/Subtract.mjs
+++ b/src/core/operations/Subtract.mjs
@@ -5,7 +5,7 @@
  */
 
 import Operation from "../Operation";
-import Arithmetic from "./baseClasses/Arithmetic";
+import Arithmetic from "../lib/Arithmetic";
 import BigNumber from "bignumber.js";
 
 /**
diff --git a/src/core/operations/Sum.mjs b/src/core/operations/Sum.mjs
index 8b2d2d9e..a79a8d7f 100644
--- a/src/core/operations/Sum.mjs
+++ b/src/core/operations/Sum.mjs
@@ -5,7 +5,7 @@
  */
 
 import Operation from "../Operation";
-import Arithmetic from "./baseClasses/Arithmetic";
+import Arithmetic from "../lib/Arithmetic";
 import BigNumber from "bignumber.js";
 
 /**