diff --git a/Sprint-2/1-key-errors/0.js b/Sprint-2/1-key-errors/0.js
index 653d6f5a0..3cdf69b36 100644
--- a/Sprint-2/1-key-errors/0.js
+++ b/Sprint-2/1-key-errors/0.js
@@ -1,6 +1,8 @@
 // Predict and explain first...
 //  =============> write your prediction here
-
+/*
+The variable 'str' must be defined before it be used in a function. As a result, an error of Identifier will occur.
+*/
 // call the function capitalise with a string input
 // interpret the error message and figure out why an error is occurring
 
@@ -10,4 +12,13 @@ function capitalise(str) {
 }
 
 // =============> write your explanation here
+// The error is occurring because the parameter 'str' is being redeclared with 'let' inside the function.
+// This causes a conflict and results in an error. To fix this, we can simply remove the 'let' keyword
+// when reassigning the value to 'str'.
+
 // =============> write your new code here
+function capitalise(str) {
+  str = `${str[0].toUpperCase()}${str.slice(1)}`;
+  return str;
+}
+//console.log(capitalise("Texto"))
diff --git a/Sprint-2/1-key-errors/1.js b/Sprint-2/1-key-errors/1.js
index f2d56151f..837568664 100644
--- a/Sprint-2/1-key-errors/1.js
+++ b/Sprint-2/1-key-errors/1.js
@@ -1,20 +1,29 @@
 // Predict and explain first...
-
+/*
+The console is returning decimalNumber, which is the original number instead of the result of the function. 
+The variable decimalNumber was declared in the function parameters.
+*/
 // Why will an error occur when this program runs?
 // =============> write your prediction here
-
+// An error of variable, because the variable decimalNumber must was declared inside of the function. 
 // Try playing computer with the example to work out what is going on
 
 function convertToPercentage(decimalNumber) {
   const decimalNumber = 0.5;
   const percentage = `${decimalNumber * 100}%`;
-
+  
   return percentage;
 }
 
 console.log(decimalNumber);
 
 // =============> write your explanation here
-
+// The variable decimalNumber was declared inside the function. Also, the console.log was trying to call the variable decimalNumber.
 // Finally, correct the code to fix the problem
 // =============> write your new code here
+
+function convertToPercentage(decimalNumber) {
+  const percentage = `${decimalNumber * 100}%`;
+  return percentage;
+}
+console.log(convertToPercentage(0.5));
diff --git a/Sprint-2/1-key-errors/2.js b/Sprint-2/1-key-errors/2.js
index aad57f7cf..ebb9a9f67 100644
--- a/Sprint-2/1-key-errors/2.js
+++ b/Sprint-2/1-key-errors/2.js
@@ -1,20 +1,29 @@
 
 // Predict and explain first BEFORE you run any code...
-
-// this function should square any number but instead we're going to get an error
+/*
+The function suppose to elevate a number to the square. However, the parameter of the function, 
+the declaration of the variable 'num' and the execution is wrong.
+*/
 
 // =============> write your prediction of the error here
+// Parameters error line 11, 3.
 
 function square(3) {
     return num * num;
 }
 
 // =============> write the error message here
-
+/* 
+SyntaxError: Unexpected number 
+function square(3)
+                ^
+*/
 // =============> explain this error message here
-
+// The parameter of the function expects a name instead of a number.
 // Finally, correct the code to fix the problem
 
 // =============> write your new code here
-
-
+function square(num){
+    return num * num;
+}
+//console.log(square(3))
diff --git a/Sprint-2/2-mandatory-debug/0.js b/Sprint-2/2-mandatory-debug/0.js
index b27511b41..bc9757dea 100644
--- a/Sprint-2/2-mandatory-debug/0.js
+++ b/Sprint-2/2-mandatory-debug/0.js
@@ -1,7 +1,7 @@
 // Predict and explain first...
-
+// The function suppose to multiply two numbers. The execution of the function includes a console.log call instead of a return.
 // =============> write your prediction here
-
+// The console is going to present two different messages. No one with the expected result.
 function multiply(a, b) {
   console.log(a * b);
 }
@@ -9,6 +9,10 @@ function multiply(a, b) {
 console.log(`The result of multiplying 10 and 32 is ${multiply(10, 32)}`);
 
 // =============> write your explanation here
-
+// The console shows the result of the multiplication 10 x 32 = 320, and the text message with the result Undefined.
 // Finally, correct the code to fix the problem
 //  =============> write your new code here
+function multiply(a,b){
+  return a * b ;
+}
+console.log(`The result of multiplying 10 ad 32 is ${multiply(10,32)}`);
\ No newline at end of file
diff --git a/Sprint-2/2-mandatory-debug/1.js b/Sprint-2/2-mandatory-debug/1.js
index 37cedfbcf..db6a4ed2b 100644
--- a/Sprint-2/2-mandatory-debug/1.js
+++ b/Sprint-2/2-mandatory-debug/1.js
@@ -1,6 +1,7 @@
 // Predict and explain first...
 //  =============> write your prediction here
-
+// This is a function to sum two numbers, 10 and 32, and show a message with the result.
+// Will return undefined error because the 'return' of the function is empty.
 function sum(a, b) {
   return;
   a + b;
@@ -9,5 +10,10 @@ function sum(a, b) {
 console.log(`The sum of 10 and 32 is ${sum(10, 32)}`);
 
 // =============> write your explanation here
+// The return of the execution code in the function must be the operation a + b
 // Finally, correct the code to fix the problem
 //  =============> write your new code here
+function sum(a,b){
+  return a + b;
+}
+console.log(`The sum of 10 and 32 is ${sum(10,32)}`);
diff --git a/Sprint-2/2-mandatory-debug/2.js b/Sprint-2/2-mandatory-debug/2.js
index 57d3f5dc3..3d26ae2ab 100644
--- a/Sprint-2/2-mandatory-debug/2.js
+++ b/Sprint-2/2-mandatory-debug/2.js
@@ -1,8 +1,9 @@
 // Predict and explain first...
-
+// The function must show the last digit a number, starting with 103, that is to say 3. 
+// Then evaluate other numbers; 42 result 2, 105 result 5, and 806 result 6.
 // Predict the output of the following code:
 // =============> Write your prediction here
-
+// The console messages will show undefined results.
 const num = 103;
 
 function getLastDigit() {
@@ -15,10 +16,24 @@ console.log(`The last digit of 806 is ${getLastDigit(806)}`);
 
 // Now run the code and compare the output to your prediction
 // =============> write the output here
+/*
+The last digit of 42 is 3
+The last digit of 105 is 3
+The last digit of 806 is 3
+ */
 // Explain why the output is the way it is
+// The function take the the number 103 from the variable num in the execution, getting the result 3. 
+// However, the parameter of the function was not stablish with the variable. As a result, the return never changed. 
 // =============> write your explanation here
+// The parameter of the function was not stablish with the variable. As a result, the return never changed. 
 // Finally, correct the code to fix the problem
 // =============> write your new code here
-
+const num = 103;
+function getLastDigit(num){
+  return num.toString().slice(-1);
+}
+console.log(`The last digit of 32 is ${getLastDigit(42)}`);
+console.log(`The last digit of 105 is ${getLastDigit(105)}`);
+console.log(`The last digit of 806 is ${getLastDigit(806)}`);
 // This program should tell the user the last digit of each number.
 // Explain why getLastDigit is not working properly - correct the problem
diff --git a/Sprint-2/3-mandatory-implement/1-bmi.js b/Sprint-2/3-mandatory-implement/1-bmi.js
index 17b1cbde1..4ca2551d2 100644
--- a/Sprint-2/3-mandatory-implement/1-bmi.js
+++ b/Sprint-2/3-mandatory-implement/1-bmi.js
@@ -16,4 +16,7 @@
 
 function calculateBMI(weight, height) {
     // return the BMI of someone based off their weight and height
-}
\ No newline at end of file
+return parseFloat((weight/(height*height)).toFixed(1));
+//return Math.round((weight/(height*height))*10)/10; //This is other option to fix the number of decimals to 1.
+}
+console.log(`According your values of weight and height, your BMI is: ${calculateBMI(90,1.73)}`);
\ No newline at end of file
diff --git a/Sprint-2/3-mandatory-implement/2-cases.js b/Sprint-2/3-mandatory-implement/2-cases.js
index 5b0ef77ad..0382eacc9 100644
--- a/Sprint-2/3-mandatory-implement/2-cases.js
+++ b/Sprint-2/3-mandatory-implement/2-cases.js
@@ -14,3 +14,8 @@
 // You will need to come up with an appropriate name for the function
 // Use the MDN string documentation to help you find a solution
 // This might help https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/String/toUpperCase
+
+function upperSnakeCase(text){
+    return (text).toUpperCase().replaceAll(' ','_');
+}
+console.log(upperSnakeCase('code your future'));
\ No newline at end of file
diff --git a/Sprint-2/3-mandatory-implement/3-to-pounds.js b/Sprint-2/3-mandatory-implement/3-to-pounds.js
index 6265a1a70..c4e5fe6b6 100644
--- a/Sprint-2/3-mandatory-implement/3-to-pounds.js
+++ b/Sprint-2/3-mandatory-implement/3-to-pounds.js
@@ -4,3 +4,20 @@
 // You will need to declare a function called toPounds with an appropriately named parameter.
 
 // You should call this function a number of times to check it works for different inputs
+
+function toPounds(number){
+    if(number.toString().slice(-1) !== 'p'){
+        number = (number.toString() + 'p');
+    } 
+    const penceString = number;    
+    const penceStringWithoutTrailingP = penceString.substring(0,penceString.length - 1);
+    const paddedPenceNumberString = penceStringWithoutTrailingP.padStart(3, "0");
+    const pounds = paddedPenceNumberString.substring(0,paddedPenceNumberString.length - 2);
+    const pence = paddedPenceNumberString.substring(paddedPenceNumberString.length - 2).padEnd(2, "0");
+    return `£${pounds}.${pence}`
+}
+console.assert(toPounds('399')==='£3.99','Test fail with; 399');
+console.assert(toPounds('399p')==='£3.99','Test fail with; 399p');
+console.assert(toPounds(40)==='£0.40','Test fail with; 40');
+console.assert(toPounds('1')==='£0.01','Test fail with; 1');
+console.assert(toPounds('34947p')==='£349.47','Test fail with; 34947p');
\ No newline at end of file
diff --git a/Sprint-2/4-mandatory-interpret/time-format.js b/Sprint-2/4-mandatory-interpret/time-format.js
index 7c98eb0e8..2aa0cae4a 100644
--- a/Sprint-2/4-mandatory-interpret/time-format.js
+++ b/Sprint-2/4-mandatory-interpret/time-format.js
@@ -11,24 +11,24 @@ function formatTimeDisplay(seconds) {
   return `${pad(totalHours)}:${pad(remainingMinutes)}:${pad(remainingSeconds)}`;
 }
 
-// You will need to play computer with this example - use the Python Visualiser https://pythontutor.com/visualize.html#mode=edit
+// You will need to play computer with this example - use the Python Visualizer https://pythontutor.com/visualize.html#mode=edit
 // to help you answer these questions
 
 // Questions
 
 // a) When formatTimeDisplay is called how many times will pad be called?
-// =============> write your answer here
+// =============> Three times
 
 // Call formatTimeDisplay with an input of 61, now answer the following:
 
 // b) What is the value assigned to num when pad is called for the first time?
-// =============> write your answer here
+// =============> 0
 
 // c) What is the return value of pad is called for the first time?
-// =============> write your answer here
+// =============> "00"
 
 // d) What is the value assigned to num when pad is called for the last time in this program?  Explain your answer
-// =============> write your answer here
+// =============> 1 the last time when pad is called is pad(remainingSeconds) the remainder of 61/60 = 1 calculated in line 6
 
 // e) What is the return value assigned to num when pad is called for the last time in this program?  Explain your answer
-// =============> write your answer here
+// =============> The return value assigned is 01, the remainder was 1 and pad function fill blanks with 0 to get 2 chars. 
diff --git a/Sprint-2/5-stretch-extend/format-time.js b/Sprint-2/5-stretch-extend/format-time.js
index 32a32e66b..1e861dac8 100644
--- a/Sprint-2/5-stretch-extend/format-time.js
+++ b/Sprint-2/5-stretch-extend/format-time.js
@@ -3,23 +3,57 @@
 // Your task is to write tests for as many different groups of input data or edge cases as you can, and fix any bugs you find.
 
 function formatAs12HourClock(time) {
-  const hours = Number(time.slice(0, 2));
-  if (hours > 12) {
-    return `${hours - 12}:00 pm`;
+  if (!time.includes(':')){
+    time = time.slice(0,-2)+':' + time.slice(-2)
   }
-  return `${time} am`;
+  let hours = Number(time.slice(0, time.indexOf(':')));
+  let minutes = time.slice(time.indexOf(':') + 1).padStart(2, '0');
+
+  let period = 'am';
+
+  if (hours === 0) {
+    hours = 12;
+  } else if (hours === 12) {
+    period = 'pm';
+  } else if (hours > 12) {
+    hours = hours - 12;
+    period = 'pm';
+  }
+
+  const formattedHours = String(hours).padStart(2, '0');
+
+  return formattedHours + ":" + minutes + " " + period;
+
 }
 
 const currentOutput = formatAs12HourClock("08:00");
 const targetOutput = "08:00 am";
-console.assert(
-  currentOutput === targetOutput,
-  `current output: ${currentOutput}, target output: ${targetOutput}`
-);
-
-const currentOutput2 = formatAs12HourClock("23:00");
-const targetOutput2 = "11:00 pm";
-console.assert(
-  currentOutput2 === targetOutput2,
-  `current output: ${currentOutput2}, target output: ${targetOutput2}`
-);
+console.assert(currentOutput === targetOutput,`current output1: ${currentOutput}, target output: ${targetOutput}`);
+
+const currentOutput7 = formatAs12HourClock("00:01");
+const targetOutput7 = "12:01 am"; // midnight 12:01 am
+console.assert(currentOutput7 === targetOutput7, `current output7: ${currentOutput7}, target output: ${targetOutput7}`);
+
+const currentOutput8 = formatAs12HourClock("12:00");
+const targetOutput8 = "12:00 pm"; // Noon 12:00 pm
+console.assert(currentOutput8 === targetOutput8, `current output8: ${currentOutput8}, target output: ${targetOutput8}`);
+
+const currentOutput2 = formatAs12HourClock("23:01");
+const targetOutput2 = "11:01 pm";
+console.assert(currentOutput2 === targetOutput2,`current output2: ${currentOutput2}, target output: ${targetOutput2}`);
+
+const currentOutput3 = formatAs12HourClock("07:34");
+const targetOutput3 = "07:34 am";
+console.assert(currentOutput3 === targetOutput3,`current output3: ${currentOutput3}, target output: ${targetOutput3}`);
+
+const currentOutput4 = formatAs12HourClock("1100");
+const targetOutput4 = ("11:00 am");
+console.assert(currentOutput4 === targetOutput4,`current output4: ${currentOutput4}, target output: ${targetOutput4}`);
+
+const currentOutput5 = formatAs12HourClock("8:24");
+const targetOutput5 = "08:24 am";
+console.assert(currentOutput5 === targetOutput5,`current output5: ${currentOutput5}, target output: ${targetOutput5}`);
+
+const currentOutput6 = formatAs12HourClock("1:01");
+const targetOutput6 = "01:01 am";
+console.assert(currentOutput6 === targetOutput6,`current output6: ${currentOutput6}, target output: ${targetOutput6}`);