Flowcharts and decision structures help Grade 9 Computer Science students see how algorithms make decisions, follow different paths, and produce outputs. This printable worksheet connects flowchart symbols with practical program logic, giving students opportunities to interpret diagrams, evaluate conditions, trace inputs, and design decision-based solutions.

Students explore how an oval represents the start or end of a process, a rectangle represents an action, and a diamond represents a decision. They examine how arrows show the direction of movement and how conditions determine which branch a program follows. Examples involving positive numbers, scores, temperatures, and even numbers connect these concepts to simple programming problems.

From recognising symbols to reasoning through algorithms

The activities progress from identifying the parts of a flowchart to explaining and applying decision logic. Students work with the vocabulary of algorithms, conditions, branches, process symbols, and program outputs while practising how to follow a sequence of steps logically.

• A dialogue-based question introduces the topic through conversation.
• A matching activity connects related items and concepts.
• A cloze passage reinforces key vocabulary and the purposes of flowchart symbols.
• A labelled diagram gives students practice identifying parts of a flowchart.
• An informational reading passage explains flowchart conventions, true-or-false conditions, branching, tracing, and logical errors.
• Multiple-choice questions assess symbol recognition, condition evaluation, comparison operators, and the selection of appropriate branches.
• True-or-false statements check understanding of flowchart conventions and decision logic.
• Short-answer questions ask students to explain paths through a diagram and distinguish between process and decision symbols.
• An extended-response task asks students to design and explain a flowchart that classifies a number as positive or not positive, including the outcomes for inputs of 7 and 0.

Teacher support included

A separate Teacher Guide PDF accompanies the worksheet. It includes learning objectives, teaching tips, discussion questions, and common mistakes. This gives teachers a practical starting point for introducing flowchart conventions, prompting students to explain their reasoning, and addressing misconceptions about conditions and branches.

Practical classroom uses

Use this Grade 9 algorithm and computational thinking resource during a Computer Science lesson, as guided practice after introducing flowchart symbols, or for independent work and revision. The reading passage provides a reference for students before they answer questions, while the diagram and written-response tasks let them demonstrate their reasoning in different ways.

The material is also useful when introducing program logic before students write code. Tracing a condition such as whether a number is greater than 10 or less than 5 encourages students to connect an input with the correct decision outcome. The final design task extends this reasoning by asking students to construct a complete decision structure and explain its behaviour for specific inputs.

Resource details: Designed for Grade 9 Computer Science, with a focus on algorithms, flowcharts, and decision structures. The resource uses a general curriculum framework and does not claim alignment to a named curriculum standard.