diff --git a/JS/05.Smallest_Multiple/05.Smallest_Multiple.js b/JS/05.Smallest_Multiple/05.Smallest_Multiple.js
new file mode 100644
index 0000000..80ff695
--- /dev/null
+++ b/JS/05.Smallest_Multiple/05.Smallest_Multiple.js
@@ -0,0 +1,23 @@
+const lcm = (firstNum, ...remainingNums) => {
+    if (remainingNums.length === 0) {
+        throw (new Error("Input for method must contain at least two numbers"));
+    }
+    if (remainingNums.length === 1) {
+        secondNum = remainingNums[0];
+        return (firstNum * secondNum) / gcd(firstNum, secondNum);
+    }
+    const [nextNum, ...otherNums] = remainingNums;
+    return lcm(lcm(firstNum, nextNum), ...otherNums);
+}
+const gcd = (firstNum, secondNum) => {
+    const biggerNum = firstNum > secondNum ? firstNum : secondNum;
+    const smallerNum = firstNum > secondNum ? secondNum : firstNum;
+    let greatestCommonFactor = smallerNum;
+    while (biggerNum % greatestCommonFactor !== 0 || smallerNum % greatestCommonFactor !== 0) {
+        greatestCommonFactor--;
+    }
+    return greatestCommonFactor;
+}
+const nums = new Array(20).fill(1);
+const firstTwentyNumbers = nums.map((num, index) => index + num);
+console.log(lcm(...firstTwentyNumbers));
\ No newline at end of file
diff --git a/README.md b/README.md
index 8875d6a..1349c12 100644
--- a/README.md
+++ b/README.md
@@ -33,8 +33,8 @@ Happy Contributing! 😃
 | 01 | [Multiples of 3 and 5](https://projecteuler.net/problem=1)                   | :white_check_mark: | :white_check_mark: | :white_check_mark: | :white_check_mark: | :white_check_mark: | :white_check_mark: | :white_check_mark: | :white_check_mark: | :white_check_mark: | :white_check_mark: | :white_check_mark: | :white_check_mark: |
 | 02 | [Even Fibonacci numbers](https://projecteuler.net/problem=2)                 | :white_check_mark: | :white_check_mark: |                    | :white_check_mark: | :white_check_mark: | :white_check_mark: | :white_check_mark: |                    | :white_check_mark: | :white_check_mark: | :white_check_mark: |                    |
 | 03 | [Largest prime factor](https://projecteuler.net/problem=3)                   | :white_check_mark: | :white_check_mark: | :white_check_mark: | :white_check_mark: |                    | :white_check_mark: | :white_check_mark: |                    | :white_check_mark: | :white_check_mark: |                    |                    |
-| 04 | [Largest palindrome product](https://projecteuler.net/problem=4)             | :white_check_mark: | :white_check_mark: |                    | :white_check_mark: |                    |                    | :white_check_mark: |                    |                    |                    |                    |                    |
-| 05 | [Smallest multiple](https://projecteuler.net/problem=5)                      | :white_check_mark: |                    |                    | :white_check_mark: |                    |                    |                    |                    | :white_check_mark: |                    |                    |                    |
+| 04 | [Largest palindrome product](https://projecteuler.net/problem=4)             | :white_check_mark: |                    |                    | :white_check_mark: |                    |                    | :white_check_mark: |                    |                    |                    |                    |                    |
+| 05 | [Smallest multiple](https://projecteuler.net/problem=5)                      | :white_check_mark: |                    | :white_check_mark: | :white_check_mark: |                    |                    |                    |                    | :white_check_mark: |                    |                    |                    |
 | 06 | [Sum square difference](https://projecteuler.net/problem=6)                  | :white_check_mark: | :white_check_mark: |                    | :white_check_mark: |                    | :white_check_mark: | :white_check_mark: |                    |                    |                    |                    |                    |
 | 07 | [10001st prime](https://projecteuler.net/problem=7)                          | :white_check_mark: |                    |                    | :white_check_mark: |                    | :white_check_mark: | :white_check_mark: |                    |                    |                    |                    |                    |
 | 08 | [Largest product in a series](https://projecteuler.net/problem=8)            |                    |                    |                    | :white_check_mark: |                    |                    |                    |                    |                    |                    |                    |                    |