diff --git a/Sprint-2/2-mandatory-errors/0.js b/Sprint-2/2-mandatory-errors/0.js
index 8db780fec..1c320ee8a 100644
--- a/Sprint-2/2-mandatory-errors/0.js
+++ b/Sprint-2/2-mandatory-errors/0.js
@@ -1,3 +1,3 @@
 //This is just an instruction for the first activity - but it is just for human consumption
 //We don't want the computer to run these 2 lines - how can we solve this problem?
-//By adding two slashes
\ No newline at end of file
+//By adding two slashes at the begining of each line.
diff --git a/Sprint-2/2-mandatory-errors/1.js b/Sprint-2/2-mandatory-errors/1.js
index a016ddc8d..070ae809b 100644
--- a/Sprint-2/2-mandatory-errors/1.js
+++ b/Sprint-2/2-mandatory-errors/1.js
@@ -1,6 +1,12 @@
 // trying to create an age variable and then reassign the value by 1
 
-const age = 33;
-age == age + 1;
+let age = 33;
+age = age + 1;
 
-console.log(age)
\ No newline at end of file
+//const age = 33;
+//age == age + 1;
+
+console.log(age)
+
+//This is a type error. For the expected result of 34, age should not be declared as a constant.
+//let should be used instead of const because const is a constant variable and  cannot be reassigned.
\ No newline at end of file
diff --git a/Sprint-2/2-mandatory-errors/2.js b/Sprint-2/2-mandatory-errors/2.js
index 5087483e7..1784fca15 100644
--- a/Sprint-2/2-mandatory-errors/2.js
+++ b/Sprint-2/2-mandatory-errors/2.js
@@ -1,5 +1,10 @@
 // Currently trying to print the string "I was born in Bolton" but it isn't working...
 // what's the error ?
 
-console.log(`I was born in ${cityOfBirth}`);
 const cityOfBirth = "Bolton";
+console.log(`I was born in ${cityOfBirth}`);
+
+
+//console.log(`I was born in ${cityOfBirth}`);
+//const cityOfBirth = "Bolton";
+//The error is that the variable should be declared as a constant before it is used in the console.log statement. 
diff --git a/Sprint-2/2-mandatory-errors/3.js b/Sprint-2/2-mandatory-errors/3.js
index 463f57a4b..53febfeb3 100644
--- a/Sprint-2/2-mandatory-errors/3.js
+++ b/Sprint-2/2-mandatory-errors/3.js
@@ -1,5 +1,4 @@
-const cardNumber = 4533787178994213;
-const last4Digits = cardNumber.slice(-4);
+
 
 // The last4Digits variable should store the last 4 digits of cardNumber
 // However, the code isn't working
@@ -7,3 +6,9 @@ const last4Digits = cardNumber.slice(-4);
 // Then run the code and see what error it gives.
 // Consider: Why does it give this error? Is this what I predicted? If not, what's different?
 // Then try updating the expression last4Digits is assigned to, in order to get the correct value
+// Expectation about the error : cardNumber is assigned a number value, a .slice function does not work on number
+// The constant last4Digits should be assigned to a String (cardNumber) to perform .slice function.
+const cardNumber = 4533787178994213;
+const last4Digits = String(cardNumber).slice(-4);
+
+console.log(last4Digits);
diff --git a/Sprint-2/2-mandatory-errors/4.js b/Sprint-2/2-mandatory-errors/4.js
index 461663dfc..6e8b4576b 100644
--- a/Sprint-2/2-mandatory-errors/4.js
+++ b/Sprint-2/2-mandatory-errors/4.js
@@ -1,2 +1,9 @@
-const 12HourClockTime = "8:53pm";
-const 24hourClockTime = "20:53";
+// const 12HourClockTime = "8:53pm";
+// const 24hourClockTime = "20:53";
+ // An identifier cannot start with a numberical value
+
+const TweleveHourClockTime = "8:53pm";
+const TwentyFourhourClockTime = "20:53";
+
+console.log(TweleveHourClockTime)
+console.log(TwentyFourhourClockTime)
\ No newline at end of file