diff --git a/package-lock.json b/package-lock.json
index fd061e8..92817cd 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -1,15 +1,15 @@
 {
-  "name": "challenge-js-03",
+  "name": "javascript-challenges",
   "version": "1.0.0",
   "lockfileVersion": 2,
   "requires": true,
   "packages": {
     "": {
-      "name": "challenge-js-03",
+      "name": "javascript-challenges",
       "version": "1.0.0",
       "license": "MIT",
       "devDependencies": {
-        "jest": "^29.0.1"
+        "jest": "29.0.1"
       }
     },
     "node_modules/@ampproject/remapping": {
diff --git a/src/factorial.js b/src/factorial.js
index 4f3ae70..2db8c80 100644
--- a/src/factorial.js
+++ b/src/factorial.js
@@ -1,5 +1,11 @@
 const factorial = (number) => {
   // your code here
+  let factorial = 1;
+
+  for(let n = 1; n <= number; n++) {
+    factorial *= n;
+  }
+  return factorial;
 }
 
 module.exports = factorial;
\ No newline at end of file
diff --git a/src/fibonacci.js b/src/fibonacci.js
index ea3270f..309d23c 100644
--- a/src/fibonacci.js
+++ b/src/fibonacci.js
@@ -1,5 +1,15 @@
 const fibonacci = (n) => {
   // your code here
+  
+  let fibonacci = [1, 1];
+
+  if(n == 1)  fibonacci = [fibonacci[0]]; 
+ 
+  for (let i = 2; i < n; i++) {
+    fibonacci[i] = fibonacci[i - 1] + fibonacci[i - 2];
+  }
+
+  return fibonacci;
 }
 
 module.exports = fibonacci;
\ No newline at end of file
diff --git a/src/primalidad.js b/src/primalidad.js
index 8bdb849..3d09d93 100644
--- a/src/primalidad.js
+++ b/src/primalidad.js
@@ -1,5 +1,12 @@
 const trialDivision = (number) => {
   // your code here
-}
+  if (number <= 0 || number == 1 || number % 1 !== 0) return false;
 
-module.exports = trialDivision;
\ No newline at end of file
+  for (let i = 2; i < number - 1; i++) {
+    if (number % i == 0) return false;
+  }
+
+  return true;
+};
+
+module.exports = trialDivision;