Computer explorers · 12/50 · Ages 8–10
The sandwich algorithm
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A pretend robot wants to make a sandwich. “Make lunch” is too vague for this game. Break the task into clear steps in a sensible order.
What you will discover
- An algorithm is a sequence of steps for a task.
- Order matters: a later step may need an earlier step’s result.
English vocabulary
- step
- bước
- algorithm
- thuật toán
Let’s play
Arrange the pretend sandwich steps.
- Put on the top slice
- Place the bottom slice
- Add the filling
See the explanation
The bottom slice holds the filling; the top slice goes last.
Practise touch typing
Place your hands on F and J and type this sentence using ten fingers.
Clear steps help a computer follow a plan.
Two little quiz questions
1. Which instruction is clearer?
- Do something
- Move one square to the right
- Be useful
Answer and explanation
Move one square to the right. A clear instruction names the action and amount.
2. Can changing step order change the result?
- Yes
- Never
- Only on Tuesdays
Answer and explanation
Yes. Some steps depend on earlier ones.