diff --git a/exercises/B-hello-world/README.md b/exercises/B-hello-world/README.md
index 8c704fb43..d3fefa036 100644
--- a/exercises/B-hello-world/README.md
+++ b/exercises/B-hello-world/README.md
@@ -14,5 +14,5 @@ Inside of `exercise.js` there's a line of code that will print "Hello world!".
 
 - Try to `console.log()` something different. For example, 'Hello World. I just started learning JavaScript!'.
 - Try to console.log() several things at once.
-- What happens when you get rid of the quote marks?
+- What happens when you get rid of the quotation mark?
 - What happens when you console.log() just a number without quotes?
diff --git a/exercises/B-hello-world/exercise.js b/exercises/B-hello-world/exercise.js
index b179ee953..00b135b46 100644
--- a/exercises/B-hello-world/exercise.js
+++ b/exercises/B-hello-world/exercise.js
@@ -1 +1,4 @@
-console.log("Hello world");
+console.log("Hello world, I just started to learning JavaScript!");
+console.log("Good Morning!");
+console.log(15);
+//console.log(without quotation mark);
diff --git a/exercises/C-variables/exercise.js b/exercises/C-variables/exercise.js
index a6bbb9786..9a882f99f 100644
--- a/exercises/C-variables/exercise.js
+++ b/exercises/C-variables/exercise.js
@@ -1,3 +1,5 @@
 // Start by creating a variable `greeting`
-
+var greeting = "Hello World!"
+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..1f2614746 100644
--- a/exercises/D-strings/exercise.js
+++ b/exercises/D-strings/exercise.js
@@ -1,3 +1,7 @@
 // Start by creating a variable `message`
+var message = "This is a string";
+var messageType = typeof message;
+
 
 console.log(message);
+console.log(messageType);
\ No newline at end of file
diff --git a/exercises/E-strings-concatenation/exercise.js b/exercises/E-strings-concatenation/exercise.js
index 2cffa6a81..85c32c15d 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`
+var greetingStart = "Hello, my name is ";
+var fname = "Mya";
 
-console.log(message);
+var greeting = greetingStart + fname;
+
+console.log(greeting);
diff --git a/exercises/F-strings-methods/exercise.js b/exercises/F-strings-methods/exercise.js
index 2cffa6a81..961c9aa10 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`
+var myName = "Mya";
+var myNameLength = myName.length;
+var message = `My name is ${myName} and my name got ${myNameLength} characters long`;
 
 console.log(message);
diff --git a/exercises/F-strings-methods/exercise2.js b/exercises/F-strings-methods/exercise2.js
index b4b46943d..ceffca781 100644
--- a/exercises/F-strings-methods/exercise2.js
+++ b/exercises/F-strings-methods/exercise2.js
@@ -1,3 +1,6 @@
-const name = " Daniel  ";
+const myName = " Daniel  ";
+var myNameTrim = myName.trim();
+var myNameLength = myName.length;
+var message = `My name is ${myNameTrim} and my name got ${myNameLength} characters long`;
 
 console.log(message);
diff --git a/exercises/G-numbers/README.md b/exercises/G-numbers/README.md
index 76a79dab2..75136adf1 100644
--- a/exercises/G-numbers/README.md
+++ b/exercises/G-numbers/README.md
@@ -6,7 +6,7 @@ Unlike strings, numbers do not need to be wrapped in quotes.
 var age = 30;
 ```
 
-You can use mathematical operators to caclulate numbers:
+You can use mathematical operators to calculate numbers:
 
 ```js
 var sum = 10 + 2; // 12
@@ -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..0d7487761 100644
--- a/exercises/G-numbers/exercise.js
+++ b/exercises/G-numbers/exercise.js
@@ -1 +1,11 @@
 // Start by creating a variables `numberOfStudents` and `numberOfMentors`
+let numberOfStudents = 15;
+let numberOfMentors = 8;
+let totalNumber = numberOfStudents + numberOfMentors;
+
+console.log(`Number of students: ${numberOfStudents}`);
+console.log(`Number of mentors: ${numberOfMentors}`);
+console.log(`Total number of students and mentors: ${totalNumber}`);
+// Number of students: 15
+// Number of mentors: 8
+// Total number of students and mentors: 23
diff --git a/exercises/I-floats/exercise.js b/exercises/I-floats/exercise.js
index a5bbcd852..87d493469 100644
--- a/exercises/I-floats/exercise.js
+++ b/exercises/I-floats/exercise.js
@@ -1,2 +1,13 @@
 var numberOfStudents = 15;
 var numberOfMentors = 8;
+
+let percentageOfStudents = (15 / 23) * 100;
+let percentageOfMentors = (8 / 23) * 100;
+
+let studentsRounded = Math.round(percentageOfStudents);
+let mentorsRounded = Math.round(percentageOfMentors);
+console.log(`Percentage of students: ${studentsRounded} % `);
+console.log(`Percentage of mentors: ${mentorsRounded} %`);
+// Number of students: 15
+// Number of mentors: 8
+// Total number of students and mentors: 23
diff --git a/exercises/J-functions/exercise.js b/exercises/J-functions/exercise.js
index 0ae5850e5..8d819a4f7 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);
-
-console.log(result);
+var result1 = halve(12);
+var result2 = halve(50);
+var result3 = halve(350);
+var result4 = halve(2540);
+console.log(result1);
+console.log(result2);
+console.log(result3);
+console.log(result4);
diff --git a/exercises/J-functions/exercise2.js b/exercises/J-functions/exercise2.js
index 82ef5e780..e395b89b2 100644
--- a/exercises/J-functions/exercise2.js
+++ b/exercises/J-functions/exercise2.js
@@ -1,7 +1,13 @@
 function triple(number) {
   // complete function here
+  return number * 3;
 }
 
 var result = triple(12);
-
+var result1 = triple(9);
+var result2 = triple(300);
+var result3 = triple(78920);
 console.log(result);
+console.log(result1);
+console.log(result2);
+console.log(result3);
diff --git a/exercises/K-functions-parameters/exercise.js b/exercises/K-functions-parameters/exercise.js
index 8d5db5e69..a4eed9d76 100644
--- a/exercises/K-functions-parameters/exercise.js
+++ b/exercises/K-functions-parameters/exercise.js
@@ -1,6 +1,7 @@
 // Complete the function so that it takes input parameters
-function multiply() {
+function multiply(num1, num2) {
   // Calculate the result of the function and return it
+  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..a600cab48 100644
--- a/exercises/K-functions-parameters/exercise2.js
+++ b/exercises/K-functions-parameters/exercise2.js
@@ -1,5 +1,7 @@
 // Declare your function first
-
+function divide (num1, num2) {
+    return num1 / num2;
+}
 var result = divide(3, 4);
 
 console.log(result);
diff --git a/exercises/K-functions-parameters/exercise3.js b/exercises/K-functions-parameters/exercise3.js
index 537e9f4ec..bdfe05005 100644
--- a/exercises/K-functions-parameters/exercise3.js
+++ b/exercises/K-functions-parameters/exercise3.js
@@ -1,5 +1,7 @@
 // Write your function here
-
+function createGreeting(name) {
+    return "Hello, my name is " + name;
+}
 var greeting = createGreeting("Daniel");
 
 console.log(greeting);
diff --git a/exercises/K-functions-parameters/exercise4.js b/exercises/K-functions-parameters/exercise4.js
index 7ab44589e..c6f35cada 100644
--- a/exercises/K-functions-parameters/exercise4.js
+++ b/exercises/K-functions-parameters/exercise4.js
@@ -1,5 +1,8 @@
 // Declare your function first
-
+function addsNumber(num1, num2) {
+    return num1 + num2;
+}
 // Call the function and assign to a variable `sum`
+var sum = addsNumber(13,124);
 
 console.log(sum);
diff --git a/exercises/K-functions-parameters/exercise5.js b/exercises/K-functions-parameters/exercise5.js
index 7c5bcd605..1d37ea143 100644
--- a/exercises/K-functions-parameters/exercise5.js
+++ b/exercises/K-functions-parameters/exercise5.js
@@ -1,5 +1,7 @@
 // Declare your function here
-
-const greeting = createLongGreeting("Daniel", 30);
+function createGreeting(name, age) {
+  return "Hello, my name is " + name + " and I'm " + age + " years old";
+}
+const greeting = createGreeting("Daniel", 30);
 
 console.log(greeting);
diff --git a/exercises/L-functions-nested/README.md b/exercises/L-functions-nested/README.md
index 1c4ae9c8a..012be64e0 100644
--- a/exercises/L-functions-nested/README.md
+++ b/exercises/L-functions-nested/README.md
@@ -9,7 +9,7 @@ function getAgeInDays(age) {
   return age * 365;
 }
 
-function createCreeting(name, age) {
+function createGreeting(name, age) {
   var ageInDays = getAgeInDays(age);
   var message =
     "My Name is " + name + " and I was born over " + ageInDays + " days ago!";
diff --git a/exercises/L-functions-nested/exercise.js b/exercises/L-functions-nested/exercise.js
index a5d377442..550119217 100644
--- a/exercises/L-functions-nested/exercise.js
+++ b/exercises/L-functions-nested/exercise.js
@@ -3,3 +3,20 @@ var mentor2 = "Irina";
 var mentor3 = "Mimi";
 var mentor4 = "Rob";
 var mentor5 = "Yohannes";
+
+function createGreeting(mentor) {
+  return "hello " + mentor;
+}
+
+function greetingInUpperCase(mentor) {
+  var greeting = createGreeting(mentor);
+  return (greeting = greeting.toLocaleUpperCase());
+}
+
+//var greeting = createGreeting(mentor1);
+
+console.log(greetingInUpperCase(mentor1));
+console.log(greetingInUpperCase(mentor2));
+console.log(greetingInUpperCase(mentor3));
+console.log(greetingInUpperCase(mentor4));
+console.log(greetingInUpperCase(mentor5));