diff --git a/Sprint-2/1-key-errors/0.js b/Sprint-2/1-key-errors/0.js
index 653d6f5a0..6c824a5f7 100644
--- a/Sprint-2/1-key-errors/0.js
+++ b/Sprint-2/1-key-errors/0.js
@@ -1,13 +1,22 @@
 // Predict and explain first...
-//  =============> write your prediction here
+//  =============> write your prediction here:
+// there is promblem declaring the string twice.
 
 // call the function capitalise with a string input
 // 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;
-}
+//function capitalise(str) {
+ // let str = `${str[0].toUpperCase()}${str.slice(1)}`;
+ // return str;
+
+//}
+
+// =============> write your explanation here: It say's syntax error "str" has been declared twice. We can change variable name in tp text or anything  else
 
-// =============> write your explanation here
 // =============> write your new code here
+
+function capitalise(text) {
+  let capitalisedText = `${text[0].toUpperCase()}${text.slice(1)}`;
+  return capitalisedText;
+}
+console.log(capitalise("hello world"));
\ No newline at end of file
diff --git a/Sprint-2/1-key-errors/1.js b/Sprint-2/1-key-errors/1.js
index f2d56151f..4b11b4c25 100644
--- a/Sprint-2/1-key-errors/1.js
+++ b/Sprint-2/1-key-errors/1.js
@@ -1,20 +1,27 @@
 // Predict and explain first...
 
 // Why will an error occur when this program runs?
-// =============> write your prediction here
+// =============> write your prediction here: const decimalNumber = 0.5; this line should be declare outside of function
 
 // Try playing computer with the example to work out what is going on
 
-function convertToPercentage(decimalNumber) {
-  const decimalNumber = 0.5;
-  const percentage = `${decimalNumber * 100}%`;
+//function convertToPercentage(decimalNumber) {
+ // const decimalNumber = 0.5;
+  //const percentage = `${decimalNumber * 100}%`;
 
-  return percentage;
-}
+  //return percentage;
+//}
 
-console.log(decimalNumber);
+//console.log(decimalNumber);
 
-// =============> write your explanation here
+// =============> write your explanation here: In line 9 const decimalNumber = 0.5; should not be in their because it will redeclare in side function which will be error, it will be local scope if its inside a function. declaring outside of code make global scope, can call through out the code.
 
 // Finally, correct the code to fix the problem
 // =============> write your new code here
+const decimalNumber = 0.5;
+function convertToPercentage(decimalNumber){
+  const percentage = `${decimalNumber*100}%`;
+  return percentage;
+
+}
+console.log(decimalNumber);
diff --git a/Sprint-2/1-key-errors/2.js b/Sprint-2/1-key-errors/2.js
index aad57f7cf..181ec7974 100644
--- a/Sprint-2/1-key-errors/2.js
+++ b/Sprint-2/1-key-errors/2.js
@@ -3,18 +3,23 @@
 
 // this function should square any number but instead we're going to get an error
 
-// =============> write your prediction of the error here
+// =============> write your prediction of the error here: because parameter should use as num .
 
-function square(3) {
-    return num * num;
-}
+//function square(3) {
+  //  return num * num;
+//}
+
+// =============> write the error message here: syntax error: unexpected number.
 
-// =============> write the error message here
+// =============> explain this error message here: We cannot use parameter as num like 3 or 4 in inside function as argument we should use num, so we can re call many times through out the code.
 
-// =============> explain this error message here
 
 // Finally, correct the code to fix the problem
 
 // =============> write your new code here
 
-
+function square(num){
+    return num * num;
+}
+console.log(square(3));
+console.log(square(4));
diff --git a/Sprint-2/2-mandatory-debug/0.js b/Sprint-2/2-mandatory-debug/0.js
index b27511b41..b0bdba4b7 100644
--- a/Sprint-2/2-mandatory-debug/0.js
+++ b/Sprint-2/2-mandatory-debug/0.js
@@ -1,14 +1,16 @@
 // Predict and explain first...
 
-// =============> write your prediction here
+// =============> write your prediction here: there is no return statement
 
-function multiply(a, b) {
-  console.log(a * b);
-}
 
-console.log(`The result of multiplying 10 and 32 is ${multiply(10, 32)}`);
 
-// =============> write your explanation here
+// =============> write your explanation here;
+//multiply function is logged with out  define so the result will be undefined, need add return statement to complete it.
 
 // 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)}`);
\ 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..45daa7d65 100644
--- a/Sprint-2/2-mandatory-debug/1.js
+++ b/Sprint-2/2-mandatory-debug/1.js
@@ -1,13 +1,17 @@
 // Predict and explain first...
-//  =============> write your prediction here
+//  =============> write your prediction here: there is ; error
 
+
+
+// =============> write your explanation here: function will be undefined because of ";" by removing ; placing a+b in same line will return function.
+// Finally, correct the code to fix the problem
+//  =============> write your new code here
 function sum(a, b) {
-  return;
-  a + b;
+  return a+b;
+  
 }
 
 console.log(`The sum of 10 and 32 is ${sum(10, 32)}`);
+//Between "return value" and "function", which one is undefined?
 
-// =============> write your explanation here
-// Finally, correct the code to fix the problem
-//  =============> write your new code here
+//return value will be undefined if function have not return statement it will automatically returns undefined. 
\ No newline at end of file
diff --git a/Sprint-2/2-mandatory-debug/2.js b/Sprint-2/2-mandatory-debug/2.js
index 57d3f5dc3..275089586 100644
--- a/Sprint-2/2-mandatory-debug/2.js
+++ b/Sprint-2/2-mandatory-debug/2.js
@@ -1,24 +1,38 @@
-// Predict and explain first...
+// Predict and explain first...because of const num, it won't change output.
 
 // Predict the output of the following code:
-// =============> Write your prediction here
+// =============> Write your prediction here: 3 
 
 const num = 103;
-
 function getLastDigit() {
   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)}`);
+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
+// =============> write the output here: 3 for all console.log.
 // Explain why the output is the way it is
-// =============> write your explanation here
+// =============> write your explanation here: 3 for all of the the console.log because it won't take any argument it will always take global variable num = 103.
 // 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)}`);
+
+// Does the function toPounds() return the last digit of the given parameter?
+// No, it doesn't return toPounds() of the last digit of the given parameter.
+
+
+
+
 // This program should tell the user the last digit of each number.
 // Explain why getLastDigit is not working properly - correct the problem
+//because of line 6.
\ No newline at end of file
diff --git a/Sprint-2/3-mandatory-implement/1-bmi.js b/Sprint-2/3-mandatory-implement/1-bmi.js
index 17b1cbde1..8adb9bc43 100644
--- a/Sprint-2/3-mandatory-implement/1-bmi.js
+++ b/Sprint-2/3-mandatory-implement/1-bmi.js
@@ -16,4 +16,10 @@
 
 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){
+    let bmi = weight /(height * height);
+    return parseFloat(bmi.toFixed(1));
+}
+
+console.log(calculateBMI(70, 2.99));
\ 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..0b032d3fd 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
+const text = `hello there`;
+console.log(text.toUpperCase().replace(/ /g, "_"));
+
+const sentence = `lord of the rings`;
+console.log(sentence.toUpperCase().replace(/ /g, "_"));
\ 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..57706ca60 100644
--- a/Sprint-2/3-mandatory-implement/3-to-pounds.js
+++ b/Sprint-2/3-mandatory-implement/3-to-pounds.js
@@ -4,3 +4,24 @@
 // 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(`The last digit of 399p is ${toPounds("399p")}`);
+console.log(`The last digit of 52p is ${toPounds("52p")}`);
+console.log(`The last digit of 1099p is ${toPounds("1099p")}`);
diff --git a/Sprint-2/4-mandatory-interpret/time-format.js b/Sprint-2/4-mandatory-interpret/time-format.js
index 7c98eb0e8..baae34072 100644
--- a/Sprint-2/4-mandatory-interpret/time-format.js
+++ b/Sprint-2/4-mandatory-interpret/time-format.js
@@ -10,6 +10,8 @@ function formatTimeDisplay(seconds) {
 
   return `${pad(totalHours)}:${pad(remainingMinutes)}:${pad(remainingSeconds)}`;
 }
+console.log(formatTimeDisplay(61)); 
+
 
 // You will need to play computer with this example - use the Python Visualiser https://pythontutor.com/visualize.html#mode=edit
 // to help you answer these questions
@@ -17,18 +19,18 @@ function formatTimeDisplay(seconds) {
 // Questions
 
 // a) When formatTimeDisplay is called how many times will pad be called?
-// =============> write your answer here
+// =============> 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
+// =============> write your answer here: 0
 
 // c) What is the return value of pad is called for the first time?
-// =============> write your answer here
+// =============> 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
+// =============> write your answer here: 1, when pad is called for the last time, pad(remainingSecond) is  remainingSecond=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
+// =============> write your answer here: It will be 01 as we used padStart(2, "0") which will make 2 digit for example if value was 1 it will return as 01.