diff --git a/logic-exercises/exercise-day-1/exercise1.js b/logic-exercises/exercise-day-1/exercise1.js
new file mode 100644
index 0000000..e186086
--- /dev/null
+++ b/logic-exercises/exercise-day-1/exercise1.js
@@ -0,0 +1,12 @@
+function findMissingNumber(array, maxSum) {
+    var arraySum = 0;
+    for (var _i = 0, array_1 = array; _i < array_1.length; _i++) {
+        var num = array_1[_i];
+        arraySum += num;
+    }
+    return maxSum - arraySum;
+}
+var array1 = [1, 2, 3, 4, 6, 7, 8, 9, 10];
+var array2 = [10, 20, 40, 50];
+console.log(findMissingNumber(array1, 55));
+console.log(findMissingNumber(array2, 150));
diff --git a/logic-exercises/exercise-day-1/exercise1.test.ts b/logic-exercises/exercise-day-1/exercise1.test.ts
new file mode 100644
index 0000000..e69de29
diff --git a/logic-exercises/exercise-day-1/exercise1.ts b/logic-exercises/exercise-day-1/exercise1.ts
new file mode 100644
index 0000000..c2ea441
--- /dev/null
+++ b/logic-exercises/exercise-day-1/exercise1.ts
@@ -0,0 +1,16 @@
+function findMissingNumber(array: number[], maxSum: number): number {
+    let arraySum = 0
+
+    for (let num of array) {
+        arraySum += num
+    }
+
+    return maxSum - arraySum
+}
+
+const array1 = [1, 2, 3, 4, 6, 7, 8, 9, 10] 
+
+const array2 = [10, 20, 40, 50] 
+
+console.log(findMissingNumber(array1, 55))
+console.log(findMissingNumber(array2, 150))
\ No newline at end of file
diff --git a/logic-exercises/exercise-day-1/package.json b/logic-exercises/exercise-day-1/package.json
new file mode 100644
index 0000000..48b31df
--- /dev/null
+++ b/logic-exercises/exercise-day-1/package.json
@@ -0,0 +1,13 @@
+{
+  "name": "exercise-day-1",
+  "version": "1.0.0",
+  "description": "",
+  "main": "index.js",
+  "scripts": {
+    "start":"clear && tsc --outFile exercise1.js exercise1.ts && node exercise1.js",
+    "test": "echo \"Error: no test specified\" && exit 1"
+  },
+  "keywords": [],
+  "author": "",
+  "license": "ISC"
+}
\ No newline at end of file