11.01 Algorithms

Worksheet

Following algorithms

State whether the following tasks can be completed by following an algorithm:

Falling asleep

Making friends

Cooking a meal from a recipe book

Building a toy out of Lego

Alana has the following algorithm for wrapping a present but it is in the wrong order:

What should be the first step?

What would be the last step?

The following instructions are in the wrong order:

What should be the second step?

What would be the last step?

What could the following algorithm be for?

Step	Instruction
1	Weigh out all the ingredients
2	Mix butter, sugar and eggs together
3	Stir in the flour
4	Bake in the oven

For each of the following algorithms, work out the output at each step and complete the table:

Step	Instruction	Output
1	\text{Start with the number }100
2	\text{Subtract }22\text{ from }100
3	\text{Round the result to the nearest ten}

Step	Instruction	Output
1	\text{Start with the number }2
2	\text{Add }2\text{ to }2
3	\text{Round your answer to the nearest ten }

Step	Instruction	Output
1	\text{Start with the number }80
2	\text{Add }19\text{ to }80
3	\text{Round the result to the nearest ten}

key elements of algorithm design: sequencing, decision-making, repetition and representation including the use of pseudocode.