You will learn
- Say which person or object is taller or shorter.
- Compare heights side by side.
- Use tallest and shortest for three objects.
- Explain a fair way to compare height.
Version 0.1 · published for early use · expert review pending Standards alignment: pending verification. Not yet reviewed against the Courseversity scorecard.
Student lesson
Words to know
Large from bottom to top.
More tall than.
The most tall of three or more.
The least tall of three or more.
1. Discover: two trees
Look at two trees outside. One looks taller. How can we be sure? What if one tree is on a hill?
2. Understand: taller and shorter
To compare how tall things are, stand them on the same flat ground. The one that reaches higher is taller. The other is shorter.
With three things we say tallest (most tall) and shortest (least tall).
Tall and long mean the same idea of measuring end to end, but we use tall for up-and-down height.
3. Explore: back to back
You need two or three friends or objects.
- Stand two friends back to back on flat ground.
- Which head is higher?
- Say: __ is taller than __.
- Line up three objects. Say the tallest and shortest.
Think about it: what did you notice?
The one whose head or top is higher is taller.
4. Practise
Guided practice
Question 1. A tree is taller than a house. Which is shorter?
The house.
Question 2. Of three towers, which is the tallest?
The one that reaches highest.
Question 3. Why stand on the same ground?
So the comparison is fair.
Independent practice
- Name something taller than you.
- Name something shorter than you.
- Which is taller: a giraffe or a cat?
- Draw three towers: tall, taller, tallest.
- Explain how to compare two trees fairly.
Answers are in the answer key below. Try first, then check.
5. Apply: everyday mathematics
A mango tree is 5 steps tall and a guava tree is 3 steps tall. Which tree is shorter?
Show a sample answer
The guava tree.
6. Common mistake
Fix: Put both on the same flat ground.
7. Check and master
Answer all questions. You will see feedback after each one.
Your result appears here after you answer every question.
8. Key takeaways
- Compare height on level ground.
- Taller, shorter, tallest, shortest.
- Compare fairly.
9. Next lesson
Next lesson: Heavier and lighter. Keep going with the next idea in this course.
Printable worksheet
- Tallest: a mouse, a dog or a horse?
- Shortest: a mouse, a dog or a horse?
- A is taller than B. Who is shorter?
- Why stand on level ground?
- Draw a tall tree and a short tree.
Homework
Compare the heights of three things at home (a cup, a bottle, a cupboard). Put them in order from shortest to tallest.
Answer key and marking scheme
| Question | Expected response | Marks |
|---|---|---|
| Tallest: a mouse, a dog or a horse? | horse | 2 |
| Shortest: a mouse, a dog or a horse? | mouse | 2 |
| A is taller than B. Who is shorter? | B | 2 |
| Why stand on level ground? | to make the comparison fair | 2 |
| Draw a tall tree and a short tree. | one tall, one short | 2 |
| Total | 10 |
Practice answers: Worksheet: 1 horse; 2 mouse; 3 B; 4 to make the comparison fair; 5 one tall, one short.
Quiz answers: 1 A, 2 B, 3 C, 4 A, 5 B, challenge C.
Mastery and remediation
| Objective | Bronze (Developing) | Silver (Proficient) | Gold (Advanced) |
|---|---|---|---|
| O1 Say which person or object is taller or shorter | Shows this with help from an adult or a picture | Does this independently and explains how they know | Explains it clearly and uses it in a new situation |
| O2 Compare heights side by side | Shows this with help from an adult or a picture | Does this independently and explains how they know | Explains it clearly and uses it in a new situation |
| O3 Use tallest and shortest for three objects | Shows this with help from an adult or a picture | Does this independently and explains how they know | Explains it clearly and uses it in a new situation |
| O4 Explain a fair way to compare height | Shows this with help from an adult or a picture | Does this independently and explains how they know | Explains it clearly and uses it in a new situation |
Proposed Courseversity thresholds for this page: Bronze = at least 3 of 5 core questions correct; Silver = all 5; Gold = all 5 plus the challenge. A badge is never a full record of progress.
If a learner struggles
- Find the misconception: Comparing heights when objects stand on different levels. Put both on the same flat ground.
- Explain another way: use real objects first, then pictures.
- Show a simpler example: Compare two very different heights first.
- Guided practice: work through one example together and let the learner try the next one.
- Reassess: use the quiz again or the worksheet.
- Move on when the learner shows Silver-level evidence independently.
Teacher package
1–5. Objectives, prerequisites, materials, preparation, duration
Lesson objectives. Learners will: say which person or object is taller or shorter; compare heights side by side; use tallest and shortest for three objects; explain a fair way to compare height.
Prerequisite knowledge. Lesson 1: longer and shorter.
Materials. Counters (stones, seeds or bottle tops), paper, pencils, board or chalkboard. Low-resource options: use stones, seeds, sticks, bottle tops or drawings in the sand or on the board instead of printed materials.
Preparation. Gather the counters and draw the example pictures on the board before the lesson.
Suggested duration. 35–45 minutes.
6–9. Teaching procedure, explanation notes, guided and independent activities
Introduction (5 min). Start with the Discover situation and let learners suggest ideas before you teach.
Explanation (10 min). Teach the Understand section with real objects first, then pictures, then symbols and words.
Guided activity (10 min). You need two or three friends or objects. Learners follow the Explore steps in pairs.
Independent activity (10 min). Learners complete the independent practice and the worksheet.
Assessment and reflection (5 min). Ask each learner to say one thing they learned and how they know it.
Teacher explanation notes. Use the concrete, pictorial, abstract order: real objects first, then pictures, then symbols and words. Return to real objects whenever a learner needs support.
10–12. Differentiation, formative assessment, common misconceptions
Support. Use real objects and work with a partner; say each step aloud together. Extension. Ask learners to make up their own example and explain it to a partner.
Formative assessment. Listen to learner explanations, ask “how do you know?”, and check the independent work.
Misconceptions. Comparing heights when objects stand on different levels. Put both on the same flat ground.
13–15. Assessment questions, answer keys, marking scheme
Use the quiz and worksheet on this page. The 10-mark scheme and all answers are in the answer key above. Re-check every answer and the marking scheme before publication.
16–19. Remediation, enrichment, homework, teacher reflection
Remediation. Compare two very different heights first. Enrichment. Invite learners to find or create three more examples at home or in the classroom and explain them. Homework. See above.
Teacher reflection. After teaching, record: which concepts learners understood; which misconceptions occurred; which activities worked; which learners need more practice; and what to improve next time.
Sources and standards
Alignment is pending verification and no external endorsement is claimed. Reference starting points named in the Courseversity standard: Common Core State Standards for Mathematics, Cambridge Primary and the IB Primary Years Programme. Specific standard codes will be added once checked against the official documents.