Unit Conversion Practice

Overview

Today’s ESOL lesson focuses on converting measurement units using clear steps, everyday contexts, and worked examples. Students practise key conversion skills for the real world (e.g., cooking, travel, sports), while strengthening reading and language needed to follow measurement instructions.

Learning intentions

• WALT use conversion factors to change between common metric units of length, mass, and capacity.
• WALT explain the steps of a conversion clearly using sentence frames and mathematical language.
• WALT check answers for reasonableness by estimating and comparing sizes.
• WALT represent conversions in both words and numbers (e.g., “1 kilometre = 1000 metres”).

Success criteria

• I can identify which units I have and which units I need to convert to.
• I can choose the correct conversion factor and multiply or divide correctly.
• I can show my working steps (or clearly explain them) so others can follow.
• I can check if my answer makes sense using an estimate.

Curriculum links

• Mathematics and statistics — measurement: solve problems involving measurement in everyday and mathematical contexts, using appropriate units and reasoning about conversions.
• English (Other) — language for learning: understand and use academic and everyday language (e.g., “convert”, “per”, “approximately”, “there are”).
• Key competencies — using language, symbols, and texts to communicate mathematical thinking; thinking critically by checking reasonableness.

Lesson structure (60 minutes)

1. 0–5 min · Warm-up (language + quick recall). Teacher shows 3 everyday prompts (e.g., “bottle 750 mL”, “distance 3.5 km”, “weight 2000 g”) and asks students to underline the units. Students quickly share what units they see and what unit they think they “want”.

2. 5–15 min · Direct teach (worked examples). Teacher models one length, one mass, and one capacity example on the board with step-by-step thinking and simple language. Students copy a “Conversion Steps” checklist and highlight keywords (unit, factor, multiply/divide, result).

• Example 1 (length): 2.5 km to metres
• Example 2 (mass): 450 g to kilograms
• Example 3 (capacity): 1.2 L to mL

3. 15–25 min · Guided practice (think-aloud to partner). Teacher gives a short set of 6 conversions (2 per category). Students work in pairs using the checklist: “I have… I need… I use… therefore…”. Teacher circulates and prompts with question stems (“Is your answer larger or smaller? Why?”).

4. 25–40 min · Practical task (real-world stations). Classroom set up as 3 stations (rotation each 5 minutes). Students choose tools: rulers/measuring jugs/picture cards (teacher-prepared) to support meaning.

• Station A: Travel cards (km ↔ m)
• Station B: Grocery cards (g ↔ kg)
• Station C: Drinks/cooking cards (L ↔ mL) Each station task includes one conversion and one reasonableness check (e.g., “Is 1.2 L equal to 12 mL or 1200 mL? Choose and explain.”).

5. 40–52 min · Error-finding and correction (language focus). Teacher displays 4 incorrect worked solutions (with small mistakes like using the wrong factor or multiply instead of divide). Students find the mistake using a “Find it, Fix it, Explain it” method. Students then rewrite one correct solution in full sentences.

6. 52–60 min · Exit ticket (formative assessment). Students complete 3 conversions (mixed) plus one sentence: “My answer makes sense because…”. Teacher collects quickly to identify common errors.

Resources

• Conversion factor card set for kg↔g, m↔km, mL↔L (metric)
• Worked example sheet with “Conversion Steps”
• Station task cards (printed)
• Rulers and measuring jug or labelled container pictures
• Highlighters/markers for units and keywords
• Whiteboards or mini-slates for practising calculations
• Sentence starters (e.g., “I have ___, I need ___, so I ___.”)
• Timer for station rotations

Assessment

• Teacher observation during guided practice: correct unit identification and correct multiply/divide choice.
• Station checks: reasonableness explanations (not only the final number).
• Exit ticket: accuracy on conversions and clarity of explanation in at least one full sentence.

Differentiation

• Support for emerging learners:
• Provide a conversion checklist and sentence starters for every task.
• Offer a “unit choice” support table (unit → factor → operation).
• Allow use of step-by-step worked templates for the first station.
• Reduce task load: fewer problems at stations while keeping the same conversion type.
• Scaffolds for diverse learners:
• Use colour-coding: starting unit colour, target unit colour, conversion factor box.
• Provide bilingual support if available (student home language summaries) through teacher-made glossaries.
• Chunk instructions into single-step directions with teacher modelling before independent work.
• Language support (ESOL):
• Teach and practise phrases: “times”, “divided by”, “so that”, “makes sense”, “about”.
• Encourage students to say the steps using the frame before writing.
• Feedback approach:
• Correct the step that caused the error (wrong factor vs. wrong operation), then re-check reasonableness.
• Dyslexia-friendly reading options:
• Provide all printed instructions in a clear font (e.g., sans-serif), larger size, and good spacing.
• Use short lines and bullet points; underline keywords (units, need, multiply, divide).
• Offer audio read-aloud of station cards and teacher instructions.
• Allow students to respond orally to demonstrate the final conversion and explanation, then write a reduced answer if needed.
• Provide worked example visuals with minimal text.

Extension (advanced learners)

• Give a mixed challenge: convert across two steps (e.g., km → m → cm, or L → mL → “per 100 mL”). Students must write a two-step explanation and include an estimate check.
• Challenge: create one “conversion trap” for a partner by writing a wrong solution and a correct solution, explaining what mistake was made (factor or operation).