diff --git a/9. Numbers to Roman Numerals/romanToNum.js b/9. Numbers to Roman Numerals/romanToNum.js
new file mode 100644
index 0000000..ac42a17
--- /dev/null
+++ b/9. Numbers to Roman Numerals/romanToNum.js	
@@ -0,0 +1,30 @@
+/* Roman to number using maps */
+
+const roman = new Map(
+    [
+        ['I', 1], 
+        ['V', 5],
+        ['X', 10],
+        ['L', 50],
+        ['C', 100],
+        ['D', 500],
+        ['M', 1000]
+    ]
+);
+
+function convertToNumberUsingMaps(romanNumeral) {
+    let result = 0;
+    let previous = 0;
+    for (let i = romanNumeral.length - 1; i >= 0; i--) {
+        const current = roman.get(romanNumeral[i]);
+        if (current < previous) {
+            result -= current;
+        } else {
+            result += current;
+        }
+        previous = current;
+    }
+    return result;
+}
+
+console.log(convertToNumberUsingMaps('MMMCMXLIX'));