diff --git a/Sprint-3/1-key-errors/0.js b/Sprint-3/1-key-errors/0.js
index 653d6f5a0..78b6084db 100644
--- a/Sprint-3/1-key-errors/0.js
+++ b/Sprint-3/1-key-errors/0.js
@@ -5,9 +5,19 @@
 // interpret the error message and figure out why an error is occurring
 
 function capitalise(str) {
-  let str = `${str[0].toUpperCase()}${str.slice(1)}`;
-  return str;
+ let str = `${str[0].toUpperCase()}${str.slice(1)}`;
+ return str;
 }
 
 // =============> write your explanation here
+// The function parameter declares the variable string in the first line and then the variable is declared again using let. This will not run because you cannot declare a variable with the same name twice.
+// The return returns the same variable making the funtion useless.
+// The is no console.log() to print anything.
 // =============> write your new code here
+
+function capitalise(str) {
+  let capitalisedStr = `${str[0].toUpperCase()}${str.slice(1)}`;
+  return capitalisedStr;
+}
+let  result = capitalise("str")
+console.log(result);
\ No newline at end of file
diff --git a/Sprint-3/1-key-errors/1.js b/Sprint-3/1-key-errors/1.js
index f2d56151f..716791ac3 100644
--- a/Sprint-3/1-key-errors/1.js
+++ b/Sprint-3/1-key-errors/1.js
@@ -5,16 +5,27 @@
 
 // Try playing computer with the example to work out what is going on
 
-function convertToPercentage(decimalNumber) {
-  const decimalNumber = 0.5;
-  const percentage = `${decimalNumber * 100}%`;
+//function convertToPercentage(decimalNumber) {
+// const decimalNumber = 0.5;
+//  const percentage = `${decimalNumber * 100}%`;
 
-  return percentage;
-}
+//  return percentage;
+//}
 
-console.log(decimalNumber);
+//console.log(decimalNumber);
 
 // =============> write your explanation here
+//The function has already declared the  decimalNumber variable. The same variable cannot be used or declared twice. 
+//The decimalNumber variable is only existing inside the the function. Therefore the console.log() will not have anything to print.
+//The decimalNumber must be called outside first.
+
 
 // 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));
\ No newline at end of file
diff --git a/Sprint-3/1-key-errors/2.js b/Sprint-3/1-key-errors/2.js
index aad57f7cf..085d9d06a 100644
--- a/Sprint-3/1-key-errors/2.js
+++ b/Sprint-3/1-key-errors/2.js
@@ -4,17 +4,25 @@
 // this function should square any number but instead we're going to get an error
 
 // =============> write your prediction of the error here
+// The will be no output printed on the console because there is no code to instructing printing.
+// The num variable is not defined and 3 is used instead of num
 
 function square(3) {
     return num * num;
 }
 
 // =============> write the error message here
+SyntaxError: Unexpected number
 
 // =============> explain this error message here
+// This error illustrates that a number was used instead of a variable name. 
 
 // Finally, correct the code to fix the problem
 
 // =============> write your new code here
 
-
+function square(num) {
+    squareNum = num * num;
+    return squareNum;
+}
+console.log(square(3));
\ No newline at end of file
diff --git a/Sprint-3/2-mandatory-debug/0.js b/Sprint-3/2-mandatory-debug/0.js
index b27511b41..23dd1f961 100644
--- a/Sprint-3/2-mandatory-debug/0.js
+++ b/Sprint-3/2-mandatory-debug/0.js
@@ -1,6 +1,8 @@
 // Predict and explain first...
 
 // =============> write your prediction here
+//The code will run and print the outcoome of (a * b), however it will have 2 outputs. 
+// The first output is the console.log(a * b) and the second output will execute the console in line 11.
 
 function multiply(a, b) {
   console.log(a * b);
@@ -9,6 +11,12 @@ function multiply(a, b) {
 console.log(`The result of multiplying 10 and 32 is ${multiply(10, 32)}`);
 
 // =============> write your explanation here
-
+// console.log is use to print the instead osf return such that the return value can be called at the end.
 // 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 and 32 is ${multiply(10, 32)}`);
+
diff --git a/Sprint-3/2-mandatory-debug/1.js b/Sprint-3/2-mandatory-debug/1.js
index 37cedfbcf..4a3139d2d 100644
--- a/Sprint-3/2-mandatory-debug/1.js
+++ b/Sprint-3/2-mandatory-debug/1.js
@@ -1,6 +1,6 @@
 // Predict and explain first...
 //  =============> write your prediction here
-
+// The return and a + b are on 2 different lines leading to a syntax error. The sum fuctions does not work like this.
 function sum(a, b) {
   return;
   a + b;
@@ -9,5 +9,12 @@ function sum(a, b) {
 console.log(`The sum of 10 and 32 is ${sum(10, 32)}`);
 
 // =============> write your explanation here
+
+//The code runs but gives undefined in the console when we call the sum(10, 32). The return function is not defined. We must define it a + b so that when we call it, it give the sum of the 2 values
 // 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)}`);
\ No newline at end of file
diff --git a/Sprint-3/2-mandatory-debug/2.js b/Sprint-3/2-mandatory-debug/2.js
index 57d3f5dc3..2e1b4508d 100644
--- a/Sprint-3/2-mandatory-debug/2.js
+++ b/Sprint-3/2-mandatory-debug/2.js
@@ -2,7 +2,7 @@
 
 // Predict the output of the following code:
 // =============> Write your prediction here
-
+// num is declared as a const variable of 103, this will give the same outcome because num is suppose to a placeholder not a number.
 const num = 103;
 
 function getLastDigit() {
@@ -14,11 +14,20 @@ console.log(`The last digit of 105 is ${getLastDigit(105)}`);
 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 output gives the same answer that is 3
+
 // Explain why the output is the way it is
-// =============> write your explanation here
+// The variable num was declared to a const number (103) instead of a placeholder therefore it cannot be changed
 // Finally, correct the code to fix the problem
-// =============> write your new code here
+function getLastDigit(num) {
+  return num.toString().slice(-1);
+}
+
+console.log(`The last digit of 42 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
+// The const variable must be removed from the code. The computer reads that first and gives the same output for all console.log statements.
+// A placeholder variable for num must be declared in the function parameter.
\ No newline at end of file
diff --git a/Sprint-3/3-mandatory-implement/1-bmi.js b/Sprint-3/3-mandatory-implement/1-bmi.js
index 58b1085f1..a480c9457 100644
--- a/Sprint-3/3-mandatory-implement/1-bmi.js
+++ b/Sprint-3/3-mandatory-implement/1-bmi.js
@@ -14,6 +14,12 @@
 // Then when we call this function with the weight and height
 // It should return a string of their Body Mass Index to 1 decimal place
 
-function calculateBMI(weight, height) {
+//function calculateBMI(weight, height) {
   // return the BMI of someone based off their weight and height
+//}
+function calculateBMI(weight, height) {
+  squareHieght = height * height;
+  calculateBMI = Math.round(((weight / squareHieght)) *10 )/10;
+  return calculateBMI
 }
+console.log(calculateBMI(70, 1.73))
diff --git a/Sprint-3/3-mandatory-implement/2-cases.js b/Sprint-3/3-mandatory-implement/2-cases.js
index 5b0ef77ad..b450427b9 100644
--- a/Sprint-3/3-mandatory-implement/2-cases.js
+++ b/Sprint-3/3-mandatory-implement/2-cases.js
@@ -14,3 +14,9 @@
 // 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 toUpperSnakeCase(str) {
+    return str.replaceAll(" ", "_").toUpperCase();
+}
+console.log(toUpperSnakeCase("hello world"))
+console.log(toUpperSnakeCase("lord of the rings"))
\ No newline at end of file
diff --git a/Sprint-3/3-mandatory-implement/3-to-pounds.js b/Sprint-3/3-mandatory-implement/3-to-pounds.js
index 10754da73..3104bc846 100644
--- a/Sprint-3/3-mandatory-implement/3-to-pounds.js
+++ b/Sprint-3/3-mandatory-implement/3-to-pounds.js
@@ -4,3 +4,15 @@
 // 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(penceString) {
+  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.log(toPounds("399p"))
+console.log(toPounds("10p"))
+console.log(toPounds("1023p"))
+console.log(toPounds("5p"))
\ No newline at end of file
diff --git a/Sprint-3/4-mandatory-interpret/time-format.js b/Sprint-3/4-mandatory-interpret/time-format.js
index c0dd9c9a5..63dd8c20b 100644
--- a/Sprint-3/4-mandatory-interpret/time-format.js
+++ b/Sprint-3/4-mandatory-interpret/time-format.js
@@ -22,17 +22,22 @@ function formatTimeDisplay(seconds) {
 
 // a) When formatTimeDisplay is called how many times will pad be called?
 // =============> write your answer here
+// 3 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 when it is called for the first time?
 // =============> write your answer here
-
+// string "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
-
+// remainingSeconds is 1, the last pad will execute so the function will divide 61 by 60 and then return the modulus or remainder which is 1. 
 // e) What is the return value of pad when it is called for the last time in this program?  Explain your answer
 // =============> write your answer here
+// "01", The pad function recieves the number 1 and converts it to a number string. 
+// The while loop checks the string length to get 1. 1 is less than 2 therefore the loop executes and adds a 0 to the string giving "01".
+// The loop will finishes because 2 is not less than 2. The function returns "01"
diff --git a/Sprint-3/5-stretch-extend/format-time.js b/Sprint-3/5-stretch-extend/format-time.js
index 32a32e66b..ed69dcc3b 100644
--- a/Sprint-3/5-stretch-extend/format-time.js
+++ b/Sprint-3/5-stretch-extend/format-time.js
@@ -2,24 +2,28 @@
 // Make sure to do the prep before you do the coursework
 // 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 `${hours - 12}:00 pm`;
+  const timeString = String(time);
+  let [hours, minutes] = timeString.split(":").map(Number);
+  if (isNaN(minutes)){
+    minutes = 0;
+  }
+  let period = "am"
+  if (hours >= 12) {
+    period = "pm";
+    if (hours > 12) {
+      hours = hours - 12;
+    }
+  } else if (hours === 0) {
+    hours = 12;
   }
-  return `${time} am`;
+  const paddedHours = String(hours).padStart(2, "0");
+  const paddedMinutes = String(minutes).padStart(2, "0");
+  return `${paddedHours}:${paddedMinutes}${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.log(formatAs12HourClock("00:30"))
+console.log(formatAs12HourClock("23:32"))
+console.log(formatAs12HourClock("08:50"))
+console.log(formatAs12HourClock("13:00"))