diff --git a/.vscode/settings.json b/.vscode/settings.json
new file mode 100644
index 000000000..f21ac442b
--- /dev/null
+++ b/.vscode/settings.json
@@ -0,0 +1,6 @@
+{
+    "cSpell.ignoreWords": [
+        "greeting",
+        "shouty"
+    ]
+}
\ No newline at end of file
diff --git a/exercises/B-hello-world/exercise.js b/exercises/B-hello-world/exercise.js
index b179ee953..84550ab9e 100644
--- a/exercises/B-hello-world/exercise.js
+++ b/exercises/B-hello-world/exercise.js
@@ -1 +1,7 @@
 console.log("Hello world");
+console.log("Hello world. I just started learning JavaScript");
+console.log("It's pretty exciting to be actually starting JavaScript");
+console.log(
+  "What happens if I remove the quotation marks? => (SyntaxError: missing ) after argument list)"
+);
+console.log(45);
diff --git a/exercises/C-variables/exercise.js b/exercises/C-variables/exercise.js
index a6bbb9786..33dd2efdb 100644
--- a/exercises/C-variables/exercise.js
+++ b/exercises/C-variables/exercise.js
@@ -1,3 +1,7 @@
 // Start by creating a variable `greeting`
 
+let greeting = "Hello, nice to meet you";
+
+console.log(greeting);
+console.log(greeting);
 console.log(greeting);
diff --git a/exercises/D-strings/exercise.js b/exercises/D-strings/exercise.js
index 2cffa6a81..29a45b07b 100644
--- a/exercises/D-strings/exercise.js
+++ b/exercises/D-strings/exercise.js
@@ -1,3 +1,6 @@
 // Start by creating a variable `message`
+let message = "This is a string";
+let 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..41feda94c 100644
--- a/exercises/E-strings-concatenation/exercise.js
+++ b/exercises/E-strings-concatenation/exercise.js
@@ -1,3 +1,7 @@
 // Start by creating a variable `message`
 
-console.log(message);
+let greetingStart = "Hello, my name is";
+let name = "Terry";
+
+let greeting = greetingStart + " " + name;
+console.log(greeting);
diff --git a/exercises/F-strings-methods/exercise.js b/exercises/F-strings-methods/exercise.js
index 2cffa6a81..4ad5d8ba4 100644
--- a/exercises/F-strings-methods/exercise.js
+++ b/exercises/F-strings-methods/exercise.js
@@ -1,3 +1,7 @@
 // Start by creating a variable `message`
+const firstName = "Terry";
+const nameLength = firstName.length;
 
-console.log(message);
+console.log(
+  `My name is ${firstName} 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..4c419fd7a 100644
--- a/exercises/F-strings-methods/exercise2.js
+++ b/exercises/F-strings-methods/exercise2.js
@@ -1,3 +1,9 @@
 const name = " Daniel  ";
+console.log(name.length);
+const trimmedName = name.trim();
+console.log(trimmedName);
 
+const nameLength = trimmedName.length;
+console.log(nameLength);
+const message = `My name is ${trimmedName} and my name is ${nameLength} characters long`;
 console.log(message);
diff --git a/exercises/G-numbers/README.md b/exercises/G-numbers/README.md
index 76a79dab2..6775ad18f 100644
--- a/exercises/G-numbers/README.md
+++ b/exercises/G-numbers/README.md
@@ -25,5 +25,5 @@ var difference = 10 - 2; // 8
 ```
 Number of students: 15
 Number of mentors: 8
-Total numnber of students and mentors: 23
+Total number of students and mentors: 23
 ```
diff --git a/exercises/G-numbers/exercise.js b/exercises/G-numbers/exercise.js
index 49e7bc00b..bae334f4d 100644
--- a/exercises/G-numbers/exercise.js
+++ b/exercises/G-numbers/exercise.js
@@ -1 +1,11 @@
 // Start by creating a variables `numberOfStudents` and `numberOfMentors`
+
+const numberOfStudents = 15;
+const numberOfMentors = 8;
+
+const totalNumber = `Total number of students and mentors: ${
+  numberOfStudents + numberOfMentors
+}`;
+console.log(`Number of students: ${numberOfStudents}`);
+console.log(`Number of mentors: ${numberOfMentors}`);
+console.log(totalNumber);
diff --git a/exercises/I-floats/exercise.js b/exercises/I-floats/exercise.js
index a5bbcd852..0f709a829 100644
--- a/exercises/I-floats/exercise.js
+++ b/exercises/I-floats/exercise.js
@@ -1,2 +1,20 @@
 var numberOfStudents = 15;
 var numberOfMentors = 8;
+var totalNumber = numberOfStudents + numberOfMentors;
+console.log(totalNumber);
+
+// Student percentage
+const percentageOfStudents = (numberOfStudents / totalNumber) * 100;
+console.log(percentageOfStudents);
+const roundedStudentPercentage = Math.round(percentageOfStudents);
+console.log(roundedStudentPercentage);
+
+// Mentor percentage
+const percentageOfMentors = (numberOfMentors / totalNumber) * 100;
+console.log(percentageOfMentors);
+const roundedMentorPercentage = Math.round(percentageOfMentors);
+console.log(roundedMentorPercentage);
+
+// Result
+console.log(`Percentage students: ${roundedStudentPercentage}%`);
+console.log(`Percentage mentors: ${roundedMentorPercentage}%`);
diff --git a/exercises/J-functions/exercise.js b/exercises/J-functions/exercise.js
index 0ae5850e5..e7278f7bd 100644
--- a/exercises/J-functions/exercise.js
+++ b/exercises/J-functions/exercise.js
@@ -1,5 +1,5 @@
 function halve(number) {
-  // complete the function here
+  return number / 2;
 }
 
 var result = halve(12);
diff --git a/exercises/J-functions/exercise2.js b/exercises/J-functions/exercise2.js
index 82ef5e780..95ef62512 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;
 }
 
 var result = triple(12);
diff --git a/exercises/K-functions-parameters/exercise.js b/exercises/K-functions-parameters/exercise.js
index 8d5db5e69..4614501b1 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;
 }
 
 // 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..425770705 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;
+}
 
 var result = divide(3, 4);
 
diff --git a/exercises/K-functions-parameters/exercise3.js b/exercises/K-functions-parameters/exercise3.js
index 537e9f4ec..45954b5ac 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..b67307257 100644
--- a/exercises/K-functions-parameters/exercise4.js
+++ b/exercises/K-functions-parameters/exercise4.js
@@ -1,5 +1,8 @@
-// Declare your function first
+function addTwoNumbers(num1, num2) {
+  return num1 + num2;
+}
 
 // Call the function and assign to a variable `sum`
+const sum = addTwoNumbers(13, 124);
 
 console.log(sum);
diff --git a/exercises/K-functions-parameters/exercise5.js b/exercises/K-functions-parameters/exercise5.js
index 7c5bcd605..69cd231f5 100644
--- a/exercises/K-functions-parameters/exercise5.js
+++ b/exercises/K-functions-parameters/exercise5.js
@@ -1,4 +1,6 @@
-// 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..b0eab80de 100644
--- a/exercises/L-functions-nested/exercise.js
+++ b/exercises/L-functions-nested/exercise.js
@@ -3,3 +3,16 @@ var mentor2 = "Irina";
 var mentor3 = "Mimi";
 var mentor4 = "Rob";
 var mentor5 = "Yohannes";
+
+function shoutyGreeting(name) {
+  function capitaliseName(name) {
+    return name.toUpperCase();
+  }
+  return `HELLO ${capitaliseName(name)}`;
+}
+
+console.log(shoutyGreeting(mentor1));
+console.log(shoutyGreeting(mentor2));
+console.log(shoutyGreeting(mentor3));
+console.log(shoutyGreeting(mentor4));
+console.log(shoutyGreeting(mentor5));
diff --git a/extra/1-currency-conversion.js b/extra/1-currency-conversion.js
index 07391e15f..e5eb1e496 100644
--- a/extra/1-currency-conversion.js
+++ b/extra/1-currency-conversion.js
@@ -5,7 +5,9 @@
   Write a function that converts a price to USD (exchange rate is 1.4 $ to £)
 */
 
-function convertToUSD() {}
+function convertToUSD(amountInGBP) {
+  return amountInGBP * 1.4;
+}
 
 /*
   CURRENCY FORMATTING
@@ -15,7 +17,10 @@ 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(amountInGBP) {
+  const convertedAmount = ((amountInGBP * 5.7) / 100) * 99;
+  return Number(convertedAmount.toFixed(2));
+}
 
 /* ======= 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 9c8ebc76a..be82d3846 100644
--- a/extra/2-piping.js
+++ b/extra/2-piping.js
@@ -16,26 +16,41 @@
   the final result to the variable goodCode
 */
 
-function add() {
-
+function add(num1, num2) {
+  return num1 + num2;
 }
 
-function multiply() {
-
+function multiply(num1, num2) {
+  return num1 * num2;
 }
 
-function format() {
-
+function format(number) {
+  return `£${number}`;
 }
 
 const startingValue = 2;
 
+// 3. Write a more readable version of what you wrote in step 2 under the BETTER PRACTICE comment. Assign
+// the final result to the variable goodCode
+// */
+
 // Why can this code be seen as bad practice? Comment your answer.
-let badCode =
+// The code is hard to read and would not be easy to understand for someone new to the code.
+
+//! **** BAD CODE ****
+
+let badCode = format(multiply(add(startingValue, 10), 2));
+
+console.log(badCode);
+
+//! **** GOOD CODE ****
+
+const addFunc = add(startingValue, 10); // 12
+const multiplyFunc = multiply(2, addFunc);
 
-/* BETTER PRACTICE */
+let goodCode = format(multiplyFunc);
 
-let goodCode =
+console.log(goodCode);
 
 /* ======= 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 7626877e7..717959521 100644
--- a/extra/3-magic-8-ball.js
+++ b/extra/3-magic-8-ball.js
@@ -45,8 +45,41 @@
 
 // This should log "The ball has shaken!"
 // and return the answer.
+
+let answers = [
+  "It is certain.",
+  "It is decidedly so.",
+  "Without a doubt.",
+  "Yes - definitely.",
+  "You may rely on it.",
+  "As I see it, yes.",
+  "Most likely.",
+  "Outlook good.",
+  "Yes.",
+  "Signs point to yes.",
+  "Reply hazy, try again.",
+  "Ask again later.",
+  "Better not tell you now.",
+  "Cannot predict now.",
+  "Concentrate and ask again.",
+  "Don't count on it.",
+  "My reply is no.",
+  "My sources say no.",
+  "Outlook not so good.",
+  "Very doubtful.",
+];
+
+function generateNumber() {
+  return Math.floor(Math.random() * 20);
+}
+
 function shakeBall() {
-  //Write your code in here
+  let randomChoice = generateNumber();
+  let chosenAnswer = answers[randomChoice];
+
+  console.log("The ball has shaken!");
+
+  return chosenAnswer;
 }
 
 /* 
@@ -58,8 +91,31 @@ function shakeBall() {
 
   This function should expect to be called with any value which was returned by the shakeBall function.
 */
+
+// **** IF/ELSE ****
+// function checkAnswer(answer) {
+//   let indexOfAnswer = answers.indexOf(answer);
+
+// if (indexOfAnswer < 5) {
+//   return "very positive";
+// } else if (indexOfAnswer < 10) {
+//   return "positive";
+// } else if (indexOfAnswer < 15) {
+//   return "negative";
+// } else {
+//   return "very negative";
+// }
+
+// **** TERNARY ****
 function checkAnswer(answer) {
-  //Write your code in here
+  let indexOfAnswer = answers.indexOf(answer);
+  return indexOfAnswer <= 5
+    ? "very positive"
+    : indexOfAnswer <= 10
+    ? "positive"
+    : indexOfAnswer <= 15
+    ? "negative"
+    : "very negative";
 }
 
 /* 
diff --git a/mandatory/1-syntax-errors.js b/mandatory/1-syntax-errors.js
index a10cc9ac2..566b465d0 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 b90d41dd1..37c4ebc15 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();
+function getStringLength(word) {
+  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 5a953ba60..e76c30eb7 100644
--- a/mandatory/3-function-output.js
+++ b/mandatory/3-function-output.js
@@ -1,16 +1,17 @@
 // Add comments to explain what this function does. You're meant to use Google!
 function getRandomNumber() {
-  return Math.random() * 10;
+  // This function generates a random number
+  return Math.random() * 10; // Returns a number between 0 and 1 (not including 1) You then multiply it by 10 to get a number.
 }
 
 // Add comments to explain what this function does. You're meant to use Google!
 function combine2Words(word1, word2) {
-  return word1.concat(word2);
+  // This function concatenates 2 strings together.
+  return word1.concat(word2); // This returns a value of the 2 arguments concatenated.
 }
 
 function concatenate(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.
+  return firstWord.concat(" ", secondWord, " ", thirdWord);
 }
 
 /* 
diff --git a/mandatory/4-tax.js b/mandatory/4-tax.js
index ba77c7ae2..7b86a9bab 100644
--- a/mandatory/4-tax.js
+++ b/mandatory/4-tax.js
@@ -5,7 +5,9 @@
   Sales tax is 20% of the price of the product.
 */
 
-function calculateSalesTax() {}
+function calculateSalesTax(price) {
+  return (price += price.toFixed(2) * 0.2);
+}
 
 /*
   CURRENCY FORMATTING
@@ -17,7 +19,10 @@ function calculateSalesTax() {}
   Remember that the prices must include the sales tax (hint: you already wrote a function for this!)
 */
 
-function addTaxAndFormatCurrency() {}
+function addTaxAndFormatCurrency(convert) {
+  const totalAmount = calculateSalesTax(convert);
+  return `£${totalAmount.toFixed(2)}`;
+}
 
 /* 
 ===================================================
diff --git a/package.json b/package.json
index 58555936d..778df9683 100644
--- a/package.json
+++ b/package.json
@@ -14,7 +14,9 @@
     "url": "https://github.com/CodeYourFuture/JavaScript-Core-1-Coursework-Week1/issues"
   },
   "jest": {
-    "setupFilesAfterEnv": ["jest-extended"]
+    "setupFilesAfterEnv": [
+      "jest-extended"
+    ]
   },
   "homepage": "https://github.com/CodeYourFuture/JavaScript-Core-1-Coursework-Week1#readme",
   "devDependencies": {