diff --git a/concatenated-sum/index.js b/concatenated-sum/index.js
new file mode 100644
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+++ b/concatenated-sum/index.js
@@ -0,0 +1,6 @@
+// https://www.codewars.com/kata/concatenated-sum/train/javascript
+
+const checkConcatenatedSum = (num, n) => {
+  num = Math.abs(num);
+  return (num+'').split('').map(d=>d.repeat(n)).reduce((a,n)=>a+(+n),0) === num;
+};
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