Algorithms & Sequences
📋 What it is
An algorithm is a precise, step-by-step set of instructions to complete a task — order matters.
🗣️ Coach says
An algorithm is just a recipe for a computer: exact steps, in the right ORDER, to get a job done. Swap two steps and you might get toast before you've put in the bread. Computers follow instructions literally, so being precise and ordering steps correctly is the very first coding skill.
🧠 Memory hook
An algorithm is an exact recipe. Right steps, right ORDER — computers are literal.
😂 Giggle
Why was the computer cold?
Because it left its Windows open!
😲 Whoa!
The word "algorithm" comes from the name of a 9th-century mathematician, al-Khwarizmi — the same name also gave us the word "algebra".
✅ Quick check: Why does the ORDER of steps matter in an algorithm?
Say your answer out loud first — then reveal.
Because a computer follows steps literally and in sequence — doing them in the wrong order gives the wrong result (like buttering bread before toasting it).
Sequence is part of an algorithm's correctness; order changes the outcome.
🪄 Trick question: Can you swap any two steps of an algorithm without changing the result?
Careful — think it through, then reveal.
No — order usually matters; swapping steps can produce a wrong or impossible result, because computers execute them in sequence.
Most steps depend on earlier ones, so order is load-bearing.
🧪 Try it! (2 minutes)
Write the exact step-by-step algorithm for making a jam sandwich. Have someone follow it LITERALLY and fix any gaps.