diff --git a/exercises/B-hello-world/exercise.js b/exercises/B-hello-world/exercise.js
index b179ee953..6a949aa04 100644
--- a/exercises/B-hello-world/exercise.js
+++ b/exercises/B-hello-world/exercise.js
@@ -1 +1,2 @@
-console.log("Hello world");
+console.log("Hello World");
+console.log(5);
\ No newline at end of file
diff --git a/exercises/C-variables/exercise.js b/exercises/C-variables/exercise.js
index a6bbb9786..36b8eca74 100644
--- a/exercises/C-variables/exercise.js
+++ b/exercises/C-variables/exercise.js
@@ -1,3 +1,11 @@
-// Start by creating a variable `greeting`
+var approach = "greeting";// Start by creating a variable `greeting`
 
-console.log(greeting);
+console.log(approach);
+
+var approach = "greeting";// Start by creating a variable `greeting`
+
+console.log(approach);
+
+var approach = "greeting";// Start by creating a variable `greeting`
+
+console.log(approach);
diff --git a/exercises/D-strings/exercise.js b/exercises/D-strings/exercise.js
index 2cffa6a81..fee4053c9 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 = "This is a String";
+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..b1b770490 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 introduction = "Hello my name is";
+const name = "  Abdulqadir";
 
-console.log(message);
+console.log(introduction);
+console.log(name);
diff --git a/exercises/F-strings-methods/exercise.js b/exercises/F-strings-methods/exercise.js
index 2cffa6a81..d3252c0ea 100644
--- a/exercises/F-strings-methods/exercise.js
+++ b/exercises/F-strings-methods/exercise.js
@@ -1,3 +1,4 @@
-// Start by creating a variable `message`
+let name = "Abdulqadir";
+let nameLength = name.length;
 
-console.log(message);
+console.log(`My name is ${name} and my name is ${name.length} characters long`);
\ No newline at end of file
diff --git a/exercises/F-strings-methods/exercise2.js b/exercises/F-strings-methods/exercise2.js
index b4b46943d..0fdb111c7 100644
--- a/exercises/F-strings-methods/exercise2.js
+++ b/exercises/F-strings-methods/exercise2.js
@@ -1,3 +1,5 @@
-const name = " Daniel  ";
+let name  = "Abdulqadir";
+let addTrim = name.trim();
+let newNameLength = addTrim.length;
 
-console.log(message);
+console.log(`my name is ${addTrim} and my name is ${newNameLength} characters long`);
\ No newline at end of file
diff --git a/exercises/G-numbers/exercise.js b/exercises/G-numbers/exercise.js
index 49e7bc00b..301fd7815 100644
--- a/exercises/G-numbers/exercise.js
+++ b/exercises/G-numbers/exercise.js
@@ -1 +1,8 @@
 // Start by creating a variables `numberOfStudents` and `numberOfMentors`
+let numberOfStudents = 15;
+let numberOfMentors = 3;
+let total = numberOfStudents + numberOfMentors;
+
+console.log(`number of students: ${numberOfStudents}`);
+console.log(`number of mentors: ${numberOfMentors}` );
+console.log(`total number of students and mentors: ${total}`);
diff --git a/exercises/I-floats/exercise.js b/exercises/I-floats/exercise.js
index a5bbcd852..759b77c6e 100644
--- a/exercises/I-floats/exercise.js
+++ b/exercises/I-floats/exercise.js
@@ -1,2 +1,15 @@
 var numberOfStudents = 15;
 var numberOfMentors = 8;
+var total = numberOfStudents + numberOfMentors;
+
+var convertStudent = numberOfStudents/total*100;
+var convertMentors = numberOfMentors/total*100;
+
+var percentageOfStudents = Math.round(convertStudent);
+var percentageOfMentors = Math.round(convertMentors);
+
+console.log(`Student percentage: ${percentageOfStudents}%`);
+console.log(`Student percentage: ${percentageOfMentors}%`);
+
+
+
diff --git a/exercises/J-functions/exercise.js b/exercises/J-functions/exercise.js
index 0ae5850e5..a239e7a4d 100644
--- a/exercises/J-functions/exercise.js
+++ b/exercises/J-functions/exercise.js
@@ -1,7 +1,13 @@
 function halve(number) {
-  // complete the function here
+  return number/2;
 }
 
 var result = halve(12);
+var result1 = halve(20);
+var result2 = halve(30);
+var result3 = halve(100);
 
 console.log(result);
+console.log(result1);
+console.log(result2);
+console.log(result3);
diff --git a/exercises/J-functions/exercise2.js b/exercises/J-functions/exercise2.js
index 82ef5e780..9b1665f53 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/README.md b/exercises/K-functions-parameters/README.md
index 02ab2a844..c961dd87c 100644
--- a/exercises/K-functions-parameters/README.md
+++ b/exercises/K-functions-parameters/README.md
@@ -42,7 +42,7 @@ function add(num1, num2) {
 
 * Write a function that takes a name (a string) and returns a greeting
 
-## Expected result
+## Expected result 
 
 ```
 Hello, my name is Daniel
diff --git a/exercises/K-functions-parameters/exercise.js b/exercises/K-functions-parameters/exercise.js
index 8d5db5e69..9e8ac798a 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..921ca0c52 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..00c010f17 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}`;
+}// Write your function here
 
 var greeting = createGreeting("Daniel");
 
diff --git a/exercises/K-functions-parameters/exercise4.js b/exercises/K-functions-parameters/exercise4.js
index 7ab44589e..c2e5cff05 100644
--- a/exercises/K-functions-parameters/exercise4.js
+++ b/exercises/K-functions-parameters/exercise4.js
@@ -1,5 +1,7 @@
-// Declare your function first
+function add(num1, num2) {
+    return num1+num2;
+}// Declare your function first
 
-// Call the function and assign to a variable `sum`
+var sum = add(13,124);// Call the function and assign to a variable `sum`
 
 console.log(sum);
diff --git a/exercises/K-functions-parameters/exercise5.js b/exercises/K-functions-parameters/exercise5.js
index 7c5bcd605..e43963566 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`
+}// Declare your function here
 
 const greeting = createLongGreeting("Daniel", 30);
 
diff --git a/exercises/L-functions-nested/exercise.js b/exercises/L-functions-nested/exercise.js
index a5d377442..0dba27846 100644
--- a/exercises/L-functions-nested/exercise.js
+++ b/exercises/L-functions-nested/exercise.js
@@ -1,5 +1,49 @@
+function percentage(num,total) {
+    return (num/total*100);
+}
+
+var numberOfStudents = 15;
+var numberOfMentors = 8;
+var total = numberOfStudents + numberOfMentors;
+var totalPercentage = percentage(numberOfStudents,numberOfMentors,total);
+
+function initialMessage(numberOfStudents, numberOfMentors){
+    message = `totalPercentage: ${numberOfStudents} ${numberOfMentors} ${Math.round(percentage)}%`;
+    return message;
+}
+
+console.log(totalPercentage);
+
+
+
+
+
+
+
+
+
+
+
+
 var mentor1 = "Daniel";
 var mentor2 = "Irina";
 var mentor3 = "Mimi";
 var mentor4 = "Rob";
 var mentor5 = "Yohannes";
+
+function shoutyGreeting(name){
+    var greeting = name.toUpperCase();
+    return greeting = `HELLO ${greeting}`;
+}
+
+var greeting1 = shoutyGreeting(mentor1);
+var greeting2 = shoutyGreeting(mentor2);
+var greeting3 = shoutyGreeting(mentor3);
+var greeting4 = shoutyGreeting(mentor4);
+var greeting5 = shoutyGreeting(mentor5);
+
+console.log(greeting1);
+console.log(greeting2);
+console.log(greeting3);
+console.log(greeting4);
+console.log(greeting5);
\ No newline at end of file
diff --git a/mandatory/1-syntax-errors.js b/mandatory/1-syntax-errors.js
index 0a21afd1b..e47e7b75b 100644
--- a/mandatory/1-syntax-errors.js
+++ b/mandatory/1-syntax-errors.js
@@ -1,16 +1,18 @@
 // 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..66e9804b0 100644
--- a/mandatory/2-logic-error.js
+++ b/mandatory/2-logic-error.js
@@ -1,16 +1,16 @@
 // 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..d5f48804b 100644
--- a/mandatory/3-function-output.js
+++ b/mandatory/3-function-output.js
@@ -1,18 +1,21 @@
 // Add comments to explain what this function does. You're meant to use Google!
 function getNumber() {
   return Math.random() * 10;
-}
+} // The Math.random() function returns a floating-point, pseudo-random number in the range 0 to less than 1 (inclusive of 0, but not 1)with approximately uniform distribution over that range — which you can then scale to your desired range. so the getnumber function multiplies the psuedo random number between 0 and 10 however not 10.
 
 // Add comments to explain what this function does. You're meant to use Google!
 function s(w1, w2) {
   return w1.concat(w2);
 }
+//I think this function allows 2 strings to be added together and create or in this case return a new string
 
 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} ${secondWord} ${thirdWord}`;
 }
 
+
 /* 
 ===================================================
 ======= TESTS - DO NOT MODIFY BELOW THIS LINE =====
diff --git a/mandatory/4-tax.js b/mandatory/4-tax.js
index c9e41c691..6b9e365fb 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*0.2);
+}
 
 /*
   CURRENCY FORMATTING
@@ -17,7 +19,9 @@ function calculateSalesTax() {}
   Remember that the prices must include the sales tax (hint: you already wrote a function for this!)
 */
 
-function addTaxAndFormatCurrency() {}
+function addTaxAndFormatCurrency(productPrices) {
+  return "£" + calculateSalesTax(productPrices).toFixed ;
+}
 
 /* 
 ===================================================