diff --git a/Sprint-2/1-key-errors/0.js b/Sprint-2/1-key-errors/0.js
index 653d6f5a0..8f466e809 100644
--- a/Sprint-2/1-key-errors/0.js
+++ b/Sprint-2/1-key-errors/0.js
@@ -11,3 +11,20 @@ function capitalise(str) {
 
 // =============> write your explanation here
 // =============> write your new code here
+
+///The error is :
+
+let str = `${str[0].toUpperCase()}${str.slice(1)}`;
+
+//str is already a parameter of the function.
+//Doing let str = ... is like giving it a new name in the same place, which JavaScript does not allow.
+//we can just use the existing str instead of declaring it again.
+
+function capitalise(str) {
+
+  // make the first letter uppercase
+
+  str = str[0].toUpperCase() + str.slice(1);
+
+  return str;
+}
diff --git a/Sprint-2/1-key-errors/1.js b/Sprint-2/1-key-errors/1.js
index f2d56151f..8cad2edf7 100644
--- a/Sprint-2/1-key-errors/1.js
+++ b/Sprint-2/1-key-errors/1.js
@@ -9,12 +9,34 @@ function convertToPercentage(decimalNumber) {
   const decimalNumber = 0.5;
   const percentage = `${decimalNumber * 100}%`;
 
-  return percentage;
+  return percentage;=
 }
-
 console.log(decimalNumber);
 
 // =============> write your explanation here
 
+Answer:
+
+The number (0.5) goes into the function — that’s our decimalNumber.
+
+We use that decimalNumber to make a percent.
+
+We don’t write const decimalNumber again because we already have it.
+
+We return the answer (like "50%").
+
+Then we call the function with 0.5 and print what it gives back.
+
 // 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..e14f62d24 100644
--- a/Sprint-2/1-key-errors/2.js
+++ b/Sprint-2/1-key-errors/2.js
@@ -6,15 +6,33 @@
 // =============> write your prediction of the error here
 
 function square(3) {
+    
     return num * num;
 }
-
 // =============> write the error message here
 
+SyntaxError: Unexpected number
+
+
 // =============> explain this error message here
 
+the function takes the number we give it (3) and times it by itself.
+
+so 3 * 3 = 9.
+
+it works now cuz we used num instead of a number in the ()
+
+
 // 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..eadee6a4e 100644
--- a/Sprint-2/2-mandatory-debug/0.js
+++ b/Sprint-2/2-mandatory-debug/0.js
@@ -10,5 +10,17 @@ console.log(`The result of multiplying 10 and 32 is ${multiply(10, 32)}`);
 
 // =============> write your explanation here
 
+the function just prints the answer, it dont return it.
+
+so when we try to use it inside the message it shows 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 and 32 is ${multiply(10, 32)}`)
+
diff --git a/Sprint-2/2-mandatory-debug/1.js b/Sprint-2/2-mandatory-debug/1.js
index 37cedfbcf..5a14317ae 100644
--- a/Sprint-2/2-mandatory-debug/1.js
+++ b/Sprint-2/2-mandatory-debug/1.js
@@ -9,5 +9,18 @@ function sum(a, b) {
 console.log(`The sum of 10 and 32 is ${sum(10, 32)}`);
 
 // =============> write your explanation here
+
+the code dont work cuz the return stops the code before it adds the numbers.
+
+so js never does a + b, that’s why it show undefined.
+
 // 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..376171437 100644
--- a/Sprint-2/2-mandatory-debug/2.js
+++ b/Sprint-2/2-mandatory-debug/2.js
@@ -1,11 +1,19 @@
 // Predict and explain first...
 
+it will print 3 for all of them
+
 // Predict the output of the following code:
+
+The last digit of 42 is 3  
+The last digit of 105 is 3  
+The last digit of 806 is 3
+
 // =============> Write your prediction here
 
 const num = 103;
 
 function getLastDigit() {
+
   return num.toString().slice(-1);
 }
 
@@ -15,9 +23,35 @@ 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 2
+
+The last digit of 105 is 5
+
+The last digit of 806 is 6
+
 // Explain why the output is the way it is
 // =============> write your explanation here
+
+It always shows 3 cuz the function just uses the num at the top (103).
+
+It ignores the numbers we put in () like 42, 105, 806.
+
+We need to let the function take a number as input.
+
 // Finally, correct the code to fix the problem
+
+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)})
+
 // =============> write your new code here
 
 // This program should tell the user the last digit of each number.
diff --git a/Sprint-2/3-mandatory-implement/1-bmi.js b/Sprint-2/3-mandatory-implement/1-bmi.js
index 17b1cbde1..40de57413 100644
--- a/Sprint-2/3-mandatory-implement/1-bmi.js
+++ b/Sprint-2/3-mandatory-implement/1-bmi.js
@@ -14,6 +14,18 @@
 // Then when we call this function with the weight and height
 // It should return 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
-}
\ No newline at end of file
+}
+
+
+function calculateBMI (weight,height) {
+
+    const bmi = weight / (height*height)
+
+    return Math.round(bmi * 10) / 10;
+
+  }
+  
+  console.log(calculateBMI(70,1.73))
+  
\ 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..767f25910 100644
--- a/Sprint-2/3-mandatory-implement/2-cases.js
+++ b/Sprint-2/3-mandatory-implement/2-cases.js
@@ -14,3 +14,18 @@
 // 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 that turns text into UPPER_SNAKE_CASE
+
+function makeUpperSnake(text) {
+
+    let newText =text.replace(/ /g,'_');
+
+    newText = newText.toUpperCase();
+
+    return newText;
+
+  }
+  console.log(makeUpperSnake("hello there"));
+  console.log(makeUpperSnake("lord of the rings"));
+  
+
diff --git a/Sprint-2/3-mandatory-implement/3-to-pounds.js b/Sprint-2/3-mandatory-implement/3-to-pounds.js
index 6265a1a70..49a148267 100644
--- a/Sprint-2/3-mandatory-implement/3-to-pounds.js
+++ b/Sprint-2/3-mandatory-implement/3-to-pounds.js
@@ -4,3 +4,28 @@
 // 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) {
+
+    let numberStr =penceString.substring(0,penceString.length -1);
+  
+    numberStr = numberStr.padStart(3,"0");
+  
+    let pounds = numberStr.substring(0, numberStr.length -2);
+  
+    let pence = numberStr.substring(numberStr.length -2).padEnd(2,"0");
+  
+    return "£" +pounds + "." +pence;
+  }
+
+console.log(toPounds("399p"));
+console.log(toPounds("50p"));
+console.log(toPounds("5p"));
+console.log(toPounds("1200p"));
+
+  
+
+
diff --git a/Sprint-2/4-mandatory-interpret/time-format.js b/Sprint-2/4-mandatory-interpret/time-format.js
index 7c98eb0e8..49c577234 100644
--- a/Sprint-2/4-mandatory-interpret/time-format.js
+++ b/Sprint-2/4-mandatory-interpret/time-format.js
@@ -19,16 +19,73 @@ function formatTimeDisplay(seconds) {
 // a) When formatTimeDisplay is called how many times will pad be called?
 // =============> write your answer here
 
-// Call formatTimeDisplay with an input of 61, now answer the following:
+Answer:  3
+
+return `${pad(totalHours)}:${pad(remainingMinutes)}:${pad(remainingSeconds)}`;
+
+pad is called three times: for totalHours, remainingMinutes, and remainingSeconds.
+
+So no matter what input we give to formatTimeDisplay, pad will always be called 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
 
+Answer;
+
+The first call is pad(totalHours).
+
+const totalHours = (totalMinutes - remainingMinutes) / 60;
+
+The value assigned to num when pad is called for the first time is 0.
+Consequently, pad(0) will return '00', which ensures that the hour is formatted correctly in the final output string
+
+
 // c) What is the return value of pad is called for the first time?
 // =============> write your answer here
 
+Answer; 1
+
+return num.toString().padStart(2, "0");
+
+num = 1
+
+num.toString() = "1"
+
+"1".padStart(2, "0") = "01"
+
+If you call pad(0), the return value will be '00'.
+
+If you call pad(1), the return value will be '01'.
+
+If you call pad(5), the return value will be '05'.
+
+If you call pad(10), the return value will be '10'
+
+
+
 // 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
+Answer; 1
+
+The last call is pad(remainingSeconds).
+
+When you call format_time_display(61):
+
+The calculations result in:
+
+total_hours = 0
+remaining_minutes = 1
+remaining_seconds = 1
+
 
 // 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
+Answwer; 01
+
+
+Third Call: pad(remaining_seconds) (where remaining_seconds = 1)
+
+Value of num for the last call: 1
+
+Return value: '01' 
diff --git a/Sprint-2/5-stretch-extend/format-time.js b/Sprint-2/5-stretch-extend/format-time.js
index 32a32e66b..826e7b184 100644
--- a/Sprint-2/5-stretch-extend/format-time.js
+++ b/Sprint-2/5-stretch-extend/format-time.js
@@ -3,22 +3,36 @@
 // 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) {
+  // Expect time in "HH:MM" format
   const hours = Number(time.slice(0, 2));
+  const mins = time.slice(3);
+
+  if (hours === 0) {
+    return `12:${mins} am`;
+  }
+
+  if (hours === 12) {
+    return `12:${mins} pm`;
+  }
+
   if (hours > 12) {
-    return `${hours - 12}:00 pm`;
+    const newHr = hours - 12;
+    // pad single digits like 1:00 -> 01:00
+    return `${String(newHr).padStart(2, "0")}:${mins} pm`;
   }
+
   return `${time} am`;
 }
 
-const currentOutput = formatAs12HourClock("08:00");
-const targetOutput = "08:00 am";
+let currentOutput = formatAs12HourClock("08:00");
+let targetOutput = "08:00 am";
 console.assert(
   currentOutput === targetOutput,
   `current output: ${currentOutput}, target output: ${targetOutput}`
 );
 
-const currentOutput2 = formatAs12HourClock("23:00");
-const targetOutput2 = "11:00 pm";
+let currentOutput2 = formatAs12HourClock("23:00");
+let targetOutput2 = "11:00 pm";
 console.assert(
   currentOutput2 === targetOutput2,
   `current output: ${currentOutput2}, target output: ${targetOutput2}`