You will learn
- Measure length with a ruler.
- Measure mass with a balance or scale.
- Measure time with a clock or timer.
- Measure volume with a measuring jug.
Version 0.2 · expanded edition · built from cited public sources Content is based on the official frameworks and sources listed under Sources and standards. No official endorsement is claimed. Written in the style of common primary school assessments. No exam result is promised.
Student lesson
- We measure with tools and units.
- A ruler measures length in centimetres.
- A scale measures mass in grams.
- A jug measures volume in millilitres.
Words to know
to find how long, heavy, full or long-lasting
a unit of length; 100 make one metre
a unit of mass
a unit of volume
1. Discover: The bean race
Two bean plants grow on the windowsill. Every day, Dayo measures them. Plant A is 6 cm tall. Plant B is 9 cm tall. “B grew three centimetres more,” he says. “Measuring tells us exactly.”
Think: How did Dayo know which plant was taller?
2. Understand: Measuring
Idea 1: Length
We measure length with a ruler. Start at 0, line up the object and read the number at the end. Length is in centimetres (cm) or metres (m).
Idea 2: Mass and volume
We measure mass with a balance or scale in grams (g) or kilograms (kg). We measure how much liquid a container holds in millilitres (ml) or litres (l) with a measuring jug.
Idea 3: Time
We measure time with a clock or timer in seconds, minutes and hours. We read from eye level and record units.
3. Worked examples
Example 1 (I show you): Measure a pencil
A pencil from 0 to 15.
- Start at 0.
- Read the end.
- 15 cm.
Answer: The pencil is 15 cm long.
Example 2 (We do it together): Read a jug
Water reaches 250 ml.
- Look at eye level.
- Read the line.
- 250 ml.
Answer: There are 250 ml.
Example 3 (You try): Compare masses
Two apples, 120 g and 150 g.
Show the steps and answer
- Heavier: 150 g.
- Difference: 30 g.
- Write the units.
Answer: The second apple is 30 g heavier.
Did you know?
The metre was first defined in France in the 1790s as one ten-millionth of the distance from the North Pole to the Equator.
Why this matters
Measuring turns observations into numbers we can compare.
4. Explore: Measure it
Measure three objects in two ways.
- Measure the length of a pencil.
- Measure the mass of a stone.
- Measure the volume of water in a cup.
- Record with units.
Think about it: what did you notice?
What did you notice? Numbers with units make records clear.
5. Practise
Say it in a sentence
Use these starters when you talk about the lesson. Say them out loud.
- A ruler measures ___.
- A scale measures ___.
- A jug measures ___.
- A clock measures ___.
Guided practice
Question 1. What tool measures length?
A ruler.
Question 2. What unit measures length?
Centimetres.
Question 3. What tool measures mass?
A scale.
Independent practice
Level 1: Start
- What tool measures length?
- What unit measures length?
- What tool measures mass?
- What unit measures liquids?
- What do we measure time with?
Level 2: Grow
- Where do you start a ruler?
- Read 7 cm and 10 cm. Which is longer?
- Why write units?
Level 3: Stretch
- Measure three objects.
- Find the difference between 120 g and 150 g.
- Explain why we read from eye level.
Answers are in the answer key below. Try first, then check.
6. Apply: Science in everyday life
What do you measure at home?
Show a sample answer
Ingredients, height, time.
Another one. Tell a family member one thing from this lesson. Use the words you learned.
Show a sample answer
A clear sentence that uses at least one word from Words to know.
7. Common mistakes
Fix: Units make numbers meaningful.
Fix: Start at 0.
8. Lesson summary and revision card
- I can measure length with a ruler.
- I can measure mass with a balance or scale.
- I can measure time with a clock or timer.
- I can measure volume with a measuring jug.
9. Check and master
Answer all 14 questions. You will see feedback after each one.
Your result appears here after you answer every question.
10. Key takeaways
- We measure with tools and units.
- A ruler measures length in centimetres.
- A scale measures mass in grams.
- A jug measures volume in millilitres.
11. Next lesson
Exam practice
These questions are written in the style of common school and international primary assessments. Try them on your own, without looking back. Then check your answers in the marking guide. The marks are shown in brackets.
- Name tools for length, mass and volume. [3 marks]
- Name three units. [3 marks]
- A pencil is 15 cm and a crayon is 9 cm. How much longer is the pencil? [2 marks]
- Why read at eye level? [2 marks]
- Describe how to use a ruler. [3 marks]
Total: 13 marks.
Marking guide and model answers
- Ruler [1]; scale [1]; jug [1]
- Any three [1 each]
- 15 − 9 [1]; 6 cm [1]
- Accuracy [1]; avoid mistakes [1]
- Start at 0 [1]; line up [1]; read the end [1]
Score guide: 12 to 13 = secure. 8 to 11 = nearly there, revise the parts you missed. Under 8 = work through the lesson again with a grown-up.
Printable worksheet
- What tool measures length?
- What unit measures length?
- What tool measures mass?
- What unit measures liquids?
- What do we measure time with?
- Where do you start a ruler?
- Read 7 cm and 10 cm. Which is longer?
- Why write units?
- Measure three objects.
- Find the difference between 120 g and 150 g.
Homework
Measure the length, mass and volume of three things at home. Record with units.
Answer key and marking scheme
| Question | Expected response | Marks |
|---|---|---|
| 1. What tool measures length? | A ruler. | 1 |
| 2. What unit measures length? | Centimetres. | 1 |
| 3. What tool measures mass? | A scale. | 1 |
| 4. What unit measures liquids? | Millilitres. | 1 |
| 5. What do we measure time with? | A clock. | 1 |
| 6. Where do you start a ruler? | At 0. | 1 |
| 7. Read 7 cm and 10 cm. Which is longer? | 10 cm. | 1 |
| 8. Why write units? | To make the number clear. | 1 |
| 9. Measure three objects. | A table. | 1 |
| 10. Find the difference between 120 g and 150 g. | 30 g. | 1 |
| Total | 10 |
Independent practice answers. Level 1: 1 A ruler.; 2 Centimetres.; 3 A scale.; 4 Millilitres.; 5 A clock.. Level 2: 1 At 0.; 2 10 cm.; 3 To make the number clear.. Level 3: 1 A table.; 2 30 g.; 3 To avoid mistakes..
Quiz answers: 1 B, 2 C, 3 A, 4 B, 5 C, 6 A, 7 B, 8 C, 9 A, 10 B, 11 C, 12 A, Challenge 1 B, Challenge 2 C.
Mastery and remediation
| Objective | Bronze (Developing) | Silver (Proficient) | Gold (Advanced) |
|---|---|---|---|
| O1 Measure length with a ruler | 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 Measure mass with a balance or scale | 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 Measure time with a clock or timer | 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 Measure volume with a measuring jug | 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 |
Courseversity badge thresholds (overall quiz score): Gold = 90–100%; Silver = 80–89.9%; Bronze = 70–79.9%. A badge is never a full record of progress.
If a learner struggles
- Find the misconception: “We can measure without units.” Units make numbers meaningful.
- Explain another way: use real objects, pictures or actions first, then words.
- Show a simpler example: Measure one object and say the unit.
- 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.
For parents and guardians
In this lesson your child learns to measure length, mass, volume and time with simple tools. You do not need to be an expert to help.
- Measure ingredients together.
- Ask, “What unit is that?”
- Measure your height.
- Ask “how do you know?” after each answer, and listen.
- Praise effort, not only right answers. Mistakes are how we learn.
- Ten to fifteen minutes a day is better than one long session.
Teacher package
1–5. Objectives, prerequisites, materials, preparation, duration
Lesson objectives. Learners will: measure length with a ruler; measure mass with a balance or scale; measure time with a clock or timer; measure volume with a measuring jug.
Prerequisite knowledge. Grade 1 science ideas: looking carefully, using the senses safely and talking about what we notice.
Materials. Rulers, a kitchen scale, a measuring jug, water, stones and pencils. Low-resource options: use chalk or charcoal on a board or wall, drawings in the sand, and objects from the classroom instead of printed materials.
Preparation. Check that tools work. Provide plastic jugs. Prepare a record table.
Suggested duration. 45–60 minutes. It can be split into two shorter sessions.
6–9. Teaching procedure, explanation notes, guided and independent activities
Introduction (5 min). Ask, “How tall is this plant?”
Explanation (10 min). Teach measuring and units.
Guided activity (10 min). Learners measure objects.
Independent activity (10 min). Learners record and compare.
Assessment and reflection (5 min). Ask each learner to say one thing they learned and how they know it.
Key questions. What tool? Which unit?
Teacher explanation notes. Start with real objects and safe, hands-on observation. Then talk about what was seen, then draw and write. Always say “how do you know?”. Keep to the safety notes, and use local, safe materials.
10–12. Differentiation, formative assessment, common misconceptions
Support. Use real objects and pictures, short sentences and a partner. Let learners point, show or draw instead of writing. Extension. Ask learners to find a new example at home and explain how they know.
Formative assessment. Listen to learners read and explain, ask “how do you know?”, and check the independent work.
Misconceptions. “We can measure without units.” Units make numbers meaningful.
13–15. Assessment questions, answer keys, marking scheme
Use the quiz, the 13-mark exam practice and the worksheet on this page. All answers and marking guides are in the answer sections above. Re-check every answer before use.
16–19. Remediation, enrichment, homework, teacher reflection
Remediation. Measure one object and say the unit. Enrichment. Look for one new example near your home or school, draw it and explain it to someone. Homework. See above.
Teacher reflection. After teaching, record: which ideas learners understood; which misconceptions occurred; which activities worked; which learners need more practice; and what to improve next time.
Sources and standards
This lesson is based on the sources below, and no official endorsement is claimed. Reference starting points: Next Generation Science Standards, Cambridge Primary Science and the IB Primary Years Programme. Where a standard code is named, it points to the official framework.
Research used to shape this lesson. Courseversity Science curriculum, Grade 2 Unit 1, topic 5; Next Generation Science Standards, science and engineering practices (asking questions, planning and carrying out investigations); Cambridge Primary Science Stage 2, thinking and working scientifically; IB Primary Years Programme, inquiry-based learning. These sources informed the lesson.