Variables in Programming — Year 5 Lesson Plan
National Curriculum: Computing KS2 — use sequence, selection and repetition in programs; work with variables and various forms of input and output
Overview
Pupils develop their understanding of variables as named containers that store values which can change during a program. They use variables to track scores, counts, and user input, and understand how variables interact with selection and loops to create dynamic programs in Scratch or Python.
Variables in Programming learning objectives
- Explain what a variable is and give examples of when variables are useful.
- Create, set, and change variables in a program.
- Use variables with loops and selection to build programs that respond to changing data.
- Trace through a program and predict the value of a variable at each step.
Key Vocabulary
Suggested Lesson Structure
Show a simple scoreboard: every time a team scores, the number goes up. Ask: what changes? What stays the same? Introduce 'variable' — a box that holds a value. What else in daily life changes like this? (temperature readings, step counters, a bank balance).
In Scratch (or Python if class is ready): create a variable called 'score'. Set it to 0 at the start. Inside a loop, if the sprite touches a coin, increment score by 1 and play a sound. Display the score on screen. Trace through: what is the value of score at the start? After collecting 3 coins? Introduce: variables can also store text (e.g. player name) or Boolean (true/false). Show how to initialise variables correctly at the start of a program.
Pupils extend a starter game in Scratch: add a 'lives' variable starting at 3 that decreases by 1 when the sprite touches a hazard. When lives reach 0, the game ends. Trace through: what happens to the variable over time?
Pupils add a timer variable to their game: it starts at 30 and counts down. If the timer reaches 0 before the player collects 5 coins, the player loses. They must: create the variable, initialise it, update it in a loop, and use selection to check the winning/losing condition.
Trace challenge: show a short program on the board with a loop and variable. Pupils write down the value of the variable after each iteration. Discuss: what is the value at the end? Why? Connect to real programs: every app on a phone uses variables to track your data.
Common Misconceptions
- Pupils often forget to initialise variables — if a variable is not set to a starting value, it may contain unexpected data from previous runs.
- Confusing variable names with their values — the name 'score' is just a label; the actual number it holds can change.
Prior Knowledge
Pupils should already be able to:
- Confident use of sequences, loops, and selection in Scratch.
- Understanding that programs can respond to conditions.
- Some exposure to the concept of input and output in programs.
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