Plant Parts in Percent

Overview

Students interpret a plant diagram as a whole divided into leaf and stem parts. They use fractions and simple percentages to describe the relationship, building on prior work with parts of a whole, equivalent fractions and benchmark percentages such as 50%, 25% and 10%.

Learning intentions

• WALT identify the whole plant representation and its leaf and stem parts.
• WALT interpret fractions as percentages of a whole.
• WALT explain what a percentage tells us about the plant.
• WALT use mathematical evidence to compare leaf and stem amounts.

Success criteria

• I can identify the whole and the parts being compared.
• I can convert a simple fraction into a percentage.
• I can state the percentage of the plant that is leaf and the percentage that is stem.
• I can explain which part is larger and how I know.

Curriculum links

• Mathematics and Statistics — Number: understanding and communicating fractions and percentages as parts of a whole.
• Mathematics and Statistics — Mathsteasers: higher-order thinking questions that deepen mathematical understanding.
• Mathematics and Statistics — Mathsteasers / Alignment: applying familiar mathematical ideas to a challenging, relevant context.
• Key competencies: thinking, using language/symbols/texts, and participating and contributing.

Lesson structure (18 minutes)

1. 0–3 min · Hook and notice. Teacher opens the plant-part hook and learning intention slides and shows a simple plant image divided into 10 equal sections, with 6 sections labelled leaf and 4 labelled stem. Ask: “What percentage of this plant is leaf? How could you prove it?” Students make a quick individual estimate, then share their reasoning with a partner.

2. 3–6 min · Model the whole. Teacher emphasises that the entire diagram represents 100%, counts the 10 equal sections, and models (6/10 = 60%) and (4/10 = 40%); clarify that the leaf and stem percentages must total 100%. Students annotate or verbally complete: “The whole is ____. The leaf part is ____. The stem part is ____.”

3. 6–12 min · Paired investigation. Teacher gives each pair the plant percentage investigation worksheet and directs students to complete the plant diagrams and percentage questions, circulating to ask, “How many equal parts make the whole?” and “What does your percentage describe?” Students identify the total, count leaf and stem sections, record fractions, convert using familiar benchmarks, and write one comparison sentence.

4. 12–15 min · Compare strategies. Teacher returns to the worked-example and discussion slides and displays two representations, such as 8 leaf sections and 2 stem sections out of 10, and 3 leaf sections and 1 stem section out of 4. Invite pairs to explain how they found 80% and 75%, including any use of equivalent fractions. Students compare methods and check that the two percentages total 100%.

5. 15–18 min · Plenary and check. Teacher displays the exit-question slide: “A plant is shown in 20 equal parts. 15 are leaf and 5 are stem. What percentage is each? Explain in one sentence.” Students record their answer on the worksheet or on a small piece of paper, then hold it up for a quick visual check and correct one misconception together.

Resources

• the plant percentage slide deck
• the plant percentage investigation worksheet
• Board or interactive display
• Pencils and highlighters
• Optional calculators for students who need them
• Enlarged plant diagrams for shared viewing

Assessment

• Listen during the hook for whether students identify the diagram as a whole and distinguish “number of sections” from “percentage”.
• Check worksheet responses for accurate totals, fraction-to-percentage conversions and comparison explanations. Confer with pairs who do not recognise tenths or quarters.
• Use the final question to assess independent understanding: accurate responses are 75% leaf and 25% stem, with percentages totalling 100%.

Differentiation

• Support students with diagrams already divided into 10 equal parts, colour-coded leaf and stem sections, a percentage reference strip showing 100%, 50%, 25% and 10%, and the sentence stems: “The whole is…”, “___ out of ___ is…”, and “There is more ___ because…”.
• For dyslexia-friendly access, use a clear sans-serif font, large print, generous spacing, short instructions and strong colour contrast. Read each question aloud, allow students to explain answers orally, and avoid requiring lengthy written responses.
• Pair students strategically so they can discuss and check counting, while still asking each learner to record an individual answer. Provide concrete paper strips or a 100-square grid for students who need to see the whole divided into equal parts.
• Extension: ask advanced learners to design a different plant diagram where the leaf percentage is between 60% and 90%, then give the stem percentage, fraction and a written justification. They can also decide whether 12 leaf sections and 8 stem sections represent more or less leaf than 15 leaf sections and 5 stem sections, explaining their comparison.