diff --git a/exercises/B-hello-world/exercise.js b/exercises/B-hello-world/exercise.js
index b179ee953..f746b5ab9 100644
--- a/exercises/B-hello-world/exercise.js
+++ b/exercises/B-hello-world/exercise.js
@@ -1 +1 @@
-console.log("Hello world");
+console.log("Hello world I just started learning JavaScript!'.");
diff --git a/exercises/C-variables/exercise.js b/exercises/C-variables/exercise.js
index a6bbb9786..f5fe5b5ae 100644
--- a/exercises/C-variables/exercise.js
+++ b/exercises/C-variables/exercise.js
@@ -1,3 +1,3 @@
 // Start by creating a variable `greeting`
-
+const greeting = "Hello world I just started learning JavaScript!";
 console.log(greeting);
diff --git a/exercises/D-strings/exercise.js b/exercises/D-strings/exercise.js
index 2cffa6a81..77ef04b5d 100644
--- a/exercises/D-strings/exercise.js
+++ b/exercises/D-strings/exercise.js
@@ -1,3 +1,6 @@
 // Start by creating a variable `message`
+const message = "Hello world I just started learning JavaScript!";
+const messageType = typeof message;
 
 console.log(message);
+console.log(messageType);
diff --git a/exercises/E-strings-concatenation/exercise.js b/exercises/E-strings-concatenation/exercise.js
index 2cffa6a81..fa9e8044a 100644
--- a/exercises/E-strings-concatenation/exercise.js
+++ b/exercises/E-strings-concatenation/exercise.js
@@ -1,3 +1,5 @@
 // Start by creating a variable `message`
+const intro = "Hello, my name is";
+const name = "Chizim";
 
-console.log(message);
+console.log(`${intro} ${name} and I like to code`);
diff --git a/exercises/F-strings-methods/exercise.js b/exercises/F-strings-methods/exercise.js
index 2cffa6a81..6dd93c668 100644
--- a/exercises/F-strings-methods/exercise.js
+++ b/exercises/F-strings-methods/exercise.js
@@ -1,3 +1,6 @@
 // Start by creating a variable `message`
 
-console.log(message);
+const  name = "Chizim";
+const nameLength = name.length; 
+
+console.log(`My name is ${name} and my name is ${nameLength} characters long`);
diff --git a/exercises/F-strings-methods/exercise2.js b/exercises/F-strings-methods/exercise2.js
index b4b46943d..3a4ba159d 100644
--- a/exercises/F-strings-methods/exercise2.js
+++ b/exercises/F-strings-methods/exercise2.js
@@ -1,3 +1,6 @@
 const name = " Daniel  ";
+const trimmedName = name.trim();
+const newNameLength = trimmedName.length;
+
+console.log(`My name is ${trimmedName} and my name is ${newNameLength} characters long`);
 
-console.log(message);
diff --git a/exercises/G-numbers/exercise.js b/exercises/G-numbers/exercise.js
index 49e7bc00b..54b89dbba 100644
--- a/exercises/G-numbers/exercise.js
+++ b/exercises/G-numbers/exercise.js
@@ -1 +1,10 @@
 // Start by creating a variables `numberOfStudents` and `numberOfMentors`
+
+const numberOfStudents = 15;
+const numberOfMentors = 3;
+
+const total = numberOfStudents + numberOfMentors;
+
+console.log(`Number of students: ${numberOfStudents}`);
+console.log(`Number of mentors: ${numberOfMentors}`);
+console.log(`Total numnber of students and mentors: ${total}`);
diff --git a/exercises/I-floats/exercise.js b/exercises/I-floats/exercise.js
index a5bbcd852..6b3b0c56b 100644
--- a/exercises/I-floats/exercise.js
+++ b/exercises/I-floats/exercise.js
@@ -1,2 +1,16 @@
 var numberOfStudents = 15;
 var numberOfMentors = 8;
+
+var total = numberOfStudents + numberOfMentors;
+
+// get percentage of students and mentors
+var convertStudents =  numberOfStudents / total * 100;
+var convertMentors =  numberOfMentors / total * 100;
+
+// round the figues to a whole number
+var percentageOfStudents = Math.round(convertStudents);
+var percentageOfMentors = Math.round(convertMentors);
+
+console.log(`Percentage students: ${percentageOfStudents}%`);
+console.log(`Percentage students: ${percentageOfMentors}%`);
+
diff --git a/exercises/J-functions/exercise.js b/exercises/J-functions/exercise.js
index 0ae5850e5..54e17a6f5 100644
--- a/exercises/J-functions/exercise.js
+++ b/exercises/J-functions/exercise.js
@@ -1,7 +1,11 @@
 function halve(number) {
-  // complete the function here
+  return number / 2;// complete the function here
 }
 
 var result = halve(12);
+var result1 = halve(10);
+var result2 = halve(9);
 
 console.log(result);
+console.log(result1);
+console.log(result2);
diff --git a/exercises/J-functions/exercise2.js b/exercises/J-functions/exercise2.js
index 82ef5e780..3ab6ad721 100644
--- a/exercises/J-functions/exercise2.js
+++ b/exercises/J-functions/exercise2.js
@@ -1,5 +1,5 @@
 function triple(number) {
-  // complete function here
+  return number * 3// complete function here
 }
 
 var result = triple(12);
diff --git a/exercises/K-functions-parameters/exercise.js b/exercises/K-functions-parameters/exercise.js
index 8d5db5e69..676cf35aa 100644
--- a/exercises/K-functions-parameters/exercise.js
+++ b/exercises/K-functions-parameters/exercise.js
@@ -1,6 +1,6 @@
 // Complete the function so that it takes input parameters
-function multiply() {
-  // Calculate the result of the function and return it
+function multiply(num1, num2) {
+  return num1 * num2; // Calculate the result of the function and return it
 }
 
 // Assign the result of calling the function the variable `result`
diff --git a/exercises/K-functions-parameters/exercise2.js b/exercises/K-functions-parameters/exercise2.js
index db7a8904b..378612fcd 100644
--- a/exercises/K-functions-parameters/exercise2.js
+++ b/exercises/K-functions-parameters/exercise2.js
@@ -1,4 +1,6 @@
-// Declare your function first
+function divide (num1, num2) {
+    return num1 / num2;
+} // Declare your function first
 
 var result = divide(3, 4);
 
diff --git a/exercises/K-functions-parameters/exercise3.js b/exercises/K-functions-parameters/exercise3.js
index 537e9f4ec..1584285e9 100644
--- a/exercises/K-functions-parameters/exercise3.js
+++ b/exercises/K-functions-parameters/exercise3.js
@@ -1,4 +1,6 @@
-// Write your function here
+function createGreeting (name) {    
+    return `Hello, my name is ${name}`;
+}
 
 var greeting = createGreeting("Daniel");
 
diff --git a/exercises/K-functions-parameters/exercise4.js b/exercises/K-functions-parameters/exercise4.js
index 7ab44589e..d6846fce1 100644
--- a/exercises/K-functions-parameters/exercise4.js
+++ b/exercises/K-functions-parameters/exercise4.js
@@ -1,5 +1,10 @@
 // Declare your function first
+function add (num1, num2) {
+    return num1 + num2;
+}
 
 // Call the function and assign to a variable `sum`
 
+var sum = add (13, 124);
+
 console.log(sum);
diff --git a/exercises/K-functions-parameters/exercise5.js b/exercises/K-functions-parameters/exercise5.js
index 7c5bcd605..06445daa2 100644
--- a/exercises/K-functions-parameters/exercise5.js
+++ b/exercises/K-functions-parameters/exercise5.js
@@ -1,4 +1,7 @@
 // Declare your function here
+function createLongGreeting(name, age){
+    return `Hello, my name is ${name} and I'm ${age} years old`;
+}
 
 const greeting = createLongGreeting("Daniel", 30);
 
diff --git a/exercises/L-functions-nested/exercise.js b/exercises/L-functions-nested/exercise.js
index a5d377442..c2fdaf4c0 100644
--- a/exercises/L-functions-nested/exercise.js
+++ b/exercises/L-functions-nested/exercise.js
@@ -1,5 +1,39 @@
+function groupPercentage(num1, num2){
+    let totalInGroup = num1 + num2;    
+    return calculatePercentage = Math.round((num1 / totalInGroup) * 100);
+}
+
+function message(numberOfStudents, numberOfMentors){
+    let percentageOfStudents = groupPercentage(numberOfStudents, numberOfMentors);
+    let percentageOfMentors = groupPercentage (numberOfMentors, numberOfStudents);
+    return `Percentage students: ${percentageOfStudents}%\nPercentage students: ${percentageOfMentors}%`;
+}
+ let percentage = message(15, 8);
+ console.log(percentage);
+
+
+// Exercise 2
+
 var mentor1 = "Daniel";
 var mentor2 = "Irina";
 var mentor3 = "Mimi";
 var mentor4 = "Rob";
 var mentor5 = "Yohannes";
+
+function shoutyGreeting(mentor){
+    let blockNames = mentor.toUpperCase();
+    return greeting = `HELLO ${blockNames}`;
+
+}
+
+var firstGreeting = shoutyGreeting(mentor1);
+var secondGreeting = shoutyGreeting(mentor2);
+var thirdGreeting = shoutyGreeting(mentor3);
+var fourthGreeting = shoutyGreeting(mentor4);
+var fifthGreeting = shoutyGreeting(mentor5);
+
+console.log(firstGreeting);
+console.log(secondGreeting);
+console.log(thirdGreeting);
+console.log(fourthGreeting);
+console.log(fifthGreeting);
\ No newline at end of file
diff --git a/extra/1-currency-conversion.js b/extra/1-currency-conversion.js
index 70a2fe863..1f803dd44 100644
--- a/extra/1-currency-conversion.js
+++ b/extra/1-currency-conversion.js
@@ -5,7 +5,11 @@
   Write a function that converts a price to USD (exchange rate is 1.4 $ to £)
 */
 
-function convertToUSD() {}
+function convertToUSD(amountInPounds) {
+  return  amountInPounds * 1.4;    
+}
+let value = convertToUSD(32);
+console.log(`Amount is $${value}`);
 
 /*
   CURRENCY FORMATTING
@@ -15,7 +19,12 @@ function convertToUSD() {}
   They have also decided that they should add a 1% fee to all foreign transactions, which means you only convert 99% of the £ to BRL.
 */
 
-function convertToBRL() {}
+function convertToBRL(moneyInPounds) {
+  let percentFee = moneyInPounds - (0.01 * moneyInPounds);
+  return Math.round((percentFee * 5.7)*100)/100;
+}
+let newValue = convertToBRL(30);
+console.log(`Amount is ${newValue} Brazilian real`);
 
 /* ======= TESTS - DO NOT MODIFY ===== 
 There are some Tests in this file that will help you work out if your code is working.
diff --git a/extra/2-piping.js b/extra/2-piping.js
index 067dd0f5b..3e40421b9 100644
--- a/extra/2-piping.js
+++ b/extra/2-piping.js
@@ -16,26 +16,34 @@
   the final result to the variable goodCode
 */
 
-function add() {
-
+function add(num1, num2) {
+    return num1 + num2;
 }
 
-function multiply() {
+console.log(add(3, 5));
 
+function multiply(num1, num2) {
+    return num1*num2;
 }
 
-function format() {
+console.log(multiply(3, 5));
 
+function format(pound) {
+    return `£${pound}`;
 }
+console.log(format(20));
+
 
 const startingValue = 2
 
 // Why can this code be seen as bad practice? Comment your answer.
-let badCode = 
+let badCode = format(multiply(add(startingValue, 10), 2)); //Very badCode as all codes are mumbled up in one line
 
 /* BETTER PRACTICE */
 
-let goodCode = 
+let sum = add(startingValue, 10);
+let product = multiply(sum, 2);
+let goodCode = format(product);
 
 /* ======= TESTS - DO NOT MODIFY ===== 
 There are some Tests in this file that will help you work out if your code is working.
diff --git a/extra/3-magic-8-ball.js b/extra/3-magic-8-ball.js
index e32182cfe..22be749d1 100644
--- a/extra/3-magic-8-ball.js
+++ b/extra/3-magic-8-ball.js
@@ -43,10 +43,95 @@
     Very doubtful.
 */
 
+let answers = [
+  { 
+    posisibility: "It is certain.",
+    type: "very positive"
+  }, 
+  { 
+    posisibility: "It is decidedly so.",
+    type: "very positive"
+  }, 
+  { 
+    posisibility: "Without a doubt.",
+    type: "very positive"
+  }, 
+  { 
+    posisibility: "Yes - definitely.",
+    type: "very positive"
+  }, 
+  { 
+    posisibility: "You may rely on it.",
+    type: "very positive"
+  },
+  { 
+    posisibility: "As I see it, yes.",
+    type: "positive"
+  },
+  { 
+    posisibility: "Most likely.",
+    type: "positive"
+  },
+  {
+    posisibility: "Outlook good.",
+    type: "positive"
+  },
+  {
+    posisibility: "Yes.",
+    type: "positive"
+  },
+  {
+    posisibility: "Signs point to yes.",
+    type: "positive"
+  },
+  {
+    posisibility: "Reply hazy, try again.",
+    type: "negative"
+  },
+  {
+    posisibility: "Ask again later.",
+    type: "negative"
+  },
+  {
+    posisibility: "Better not tell you now.",
+    type: "negative"
+  },
+  {
+    posisibility: "Cannot predict now.",
+    type: "negative"
+  },
+  {
+    posisibility: "Concentrate and ask again.",
+    type: "negative"
+  },
+  {
+    posisibility: "Don't count on it.",
+    type: "very negative"
+  },
+  {
+    posisibility: "My reply is no.",
+    type: "very negative"
+  },
+  {
+    posisibility: "My sources say no.",
+    type: "very negative"
+  },
+  {
+    posisibility: "Outlook not so good.",
+    type: "very negative"
+  },
+  { 
+    posisibility: "Very doubtful.",
+    type: "very negative"
+  }
+]
+
 // This should log "The ball has shaken!"
 // and return the answer.
 function shakeBall() {
-  //Write your code in here
+  let randomAnswer = Math.floor(Math.random() * 20);
+  console.log("The ball has shaken!")
+  return answers[randomAnswer].posisibility;
 }
 
 /* 
@@ -59,7 +144,10 @@ function shakeBall() {
   This function should expect to be called with any value which was returned by the shakeBall function.
 */
 function checkAnswer(answer) {
-  //Write your code in here
+  let result = answers.filter(object => {
+  return object.posisibility === answer
+  });
+  return result[0].type;
 }
 
 /* 
diff --git a/mandatory/1-syntax-errors.js b/mandatory/1-syntax-errors.js
index 0a21afd1b..ffdc989eb 100644
--- a/mandatory/1-syntax-errors.js
+++ b/mandatory/1-syntax-errors.js
@@ -1,16 +1,17 @@
 // There are syntax errors in this code - can you fix it to pass the tests?
 
-function addNumbers(a b c) {
+function addNumbers(a, b, c) {
     return a + b + c;
 }
 
-function introduceMe(name, age)
-return "Hello, my name is " + name "and I am " age + "years old";
+function introduceMe(name, age) {
+    return "Hello, my name is " + name + " and I am " + age + " years old";
+}
 
 function getTotal(a, b) {
-    total = a ++ b;
+    total = a + b;
 
-    return "The total is total"
+    return `The total is ${total}` 
 }
 
 /* 
diff --git a/mandatory/2-logic-error.js b/mandatory/2-logic-error.js
index 3c578ad87..1f1245b39 100644
--- a/mandatory/2-logic-error.js
+++ b/mandatory/2-logic-error.js
@@ -1,16 +1,15 @@
 // The syntax for this function is valid but it has an error, find it and fix it.
 
 function trimWord(word) {
-  return wordtrim();
+  return word.trim();
 }
 
 function getWordLength(word) {
-  return "word".length();
+  return word.length;
 }
 
 function multiply(a, b, c) {
-  a * b * c;
-  return;
+  return a * b * c;
 }
 
 /* 
diff --git a/mandatory/3-function-output.js b/mandatory/3-function-output.js
index c9221a200..28c4bb067 100644
--- a/mandatory/3-function-output.js
+++ b/mandatory/3-function-output.js
@@ -1,14 +1,15 @@
 // Add comments to explain what this function does. You're meant to use Google!
 function getNumber() {
-  return Math.random() * 10;
+  return Math.random() * 10; //returns random number between 0 to 10 but not 10
 }
 
 // Add comments to explain what this function does. You're meant to use Google!
 function s(w1, w2) {
-  return w1.concat(w2);
+  return w1.concat(w2); // joins w1 and w2 together
 }
 
 function concatenate(firstWord, secondWord, thirdWord) {
+  return `${firstWord} ${secondWord} ${thirdWord}`;
   // Write the body of this function to concatenate three words together.
   // Look at the test case below to understand what this function is expected to return.
 }
diff --git a/mandatory/4-tax.js b/mandatory/4-tax.js
index c9e41c691..9bd39434f 100644
--- a/mandatory/4-tax.js
+++ b/mandatory/4-tax.js
@@ -5,7 +5,12 @@
   Sales tax is 20% of the price of the product
 */
 
-function calculateSalesTax() {}
+// pruductPrize is the prize before tax
+
+function calculateSalesTax(productPrize) {
+  let salesTaxPercentage = 0.2;
+  return productPrize + productPrize * salesTaxPercentage; // returns sales prize after tax
+}
 
 /*
   CURRENCY FORMATTING
@@ -17,7 +22,10 @@ function calculateSalesTax() {}
   Remember that the prices must include the sales tax (hint: you already wrote a function for this!)
 */
 
-function addTaxAndFormatCurrency() {}
+function addTaxAndFormatCurrency(productPrize) {
+  let newValue = `£${calculateSalesTax(productPrize).toFixed(2)}`;
+  return newValue;
+}
 
 /* 
 ===================================================
diff --git a/mandatory/package-lock.json b/mandatory/package-lock.json
new file mode 100644
index 000000000..48e341a09
--- /dev/null
+++ b/mandatory/package-lock.json
@@ -0,0 +1,3 @@
+{
+  "lockfileVersion": 1
+}