Correcting Algorithms
Lesson Instructions
Watch and follow the YouTube video, the lesson contains three parts:
Key Information and content - all you need to do here is watch and listen. We recommend you take some notes for this one!
Learning activity - You are to complete an activity that requires you to correct a series of algorithms so that they do what is intended.
Consolidation - these are past exam question and are for deliberate practice to check your understanding.
Correcting Algorithms Full Lesson Video.mp4Task - Correcting Algorithms Activity
Task - Exam Questions - Deliberate Practice
Mark Scheme
Question 1 (a)
1 mark per bullet to max 2.
x = 20
y = 20
Question 1 (b)
One mark per bullet
Inputs are written the same as the algorithm given
New variable created to temporarily store value
Swaps are correctly made
E.g.
x = input(“Enter first number:”)
y = input(“Enter second number:”)
temp = x
x = y
y = temp
Question 2
1 mark per bullet
Algorithm takes two inputs as per example
If used to check one value bigger than another and output correct variable
Elseif used to check the other option and output correct variable
Else used to confirm whether they are the same
NOTE: As long as the logic is there award marks.
E.g
num1 = input(“Enter number 1:”)
num2 = input(“Enter number 2:”)
if num1 > num2 then
print(num1)
elseif num2 > num1 then
print(num2)
else
print(“Numbers are the same”)
endif