diff --git a/MultiplesOf3or5.js b/MultiplesOf3or5.js
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+// https://www.codewars.com/kata/multiples-of-3-or-5
+
+// Description:
+// If we list all the natural numbers below 10 that are multiples of 3 or 5, we get 3, 5, 6 and 9. The sum of these multiples is 23.
+// Finish the solution so that it returns the sum of all the multiples of 3 or 5 below the number passed in.
+// Note: If the number is a multiple of both 3 and 5, only count it once.
+
+function solution(number){
+  let sum = 0;
+
+  for (let currentNum = 0; currentNum < number; currentNum++) {
+    const multipleOf3 = currentNum % 3 === 0;
+    const multipleOf5 = currentNum % 5 === 0;
+    
+    sum = multipleOf3 || multipleOf5 ? (currentNum + sum) : sum;
+  }
+  return sum;
+}
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