Math // Measurement

Choosing measurement units

Choose and use appropriate standard units to measure length (m/cm), mass (kg/g), temperature (°C), and capacity (litres/ml) to the nearest appropriate unit

Ages
6 to 7
Type
Method
Builds on
3 topics
Leads to
3 topics
Standards
1 code

Quick check

If you ask the learner whether to measure a swimming pool or a piece of paper in cm or m, can they pick the sensible unit for each — and explain why?

Ask this to see whether the topic is secure.

Topic // Mastery

What mastery looks like

What a learner can do once this topic is secure.
  • Measure the length of a table in centimetres using a ruler
  • Weigh an object in grams using a scale
  • Measure the capacity of a container in millilitres using a measuring jug

Topic // Map

Where this fits

What to learn first and what this topic opens up, with the reason for each link. Required links come first.
  • RequiredMust come first
  • HelpfulHelps, but not essential

Before this

3 topics

You are here

Choosing measurement units

Ages 6 to 7 // Method

Leads to

3 topics

Topic // Research-informed

Teaching notes

From the Marble Skill Taxonomy. These notes have not been validated in classrooms, so treat them as a starting point for your own judgement.

The approach

Children aged 6–7 learn to measure in appropriate standard units: length (m/cm), mass (kg/g), temperature (°C) and capacity (litres/ml). The skill has two joined parts: first name the attribute (how long? how heavy? how much fills it? how hot?) so the unit family and instrument match, then choose the grain of unit that yields a readable, precise number (a pencil in cm, not m; a drink in ml, not litres), and read the instrument to the nearest sensible mark.

Common misconceptions

  • Uses a unit or tool from the wrong attribute — e.g. reaches for a ruler to find 'how much water', or gives grams for a length.
  • Picks the wrong grain — measures a pencil in metres ('0 m') or a room laboriously in centimetres — not choosing to the nearest appropriate unit.
  • Happily reports a non-standard count ('6 cubes') when a standard measurement is asked for, not seeing why standard units matter.
  • Reads the instrument carelessly — doesn't measure to the nearest mark, mis-reads the jug's meniscus or the scale.

Useful representations

  • A measuring station: ruler/tape, kitchen scale, measuring jug, thermometer, with unit dials m/cm, kg/g, l/ml, °C
  • Benchmark objects for each unit (a metre stick, a 1 kg bag, a 1 litre bottle)
  • A sorting chart matching everyday objects to their sensible unit
  • The 'same object, different hand-spans' contrast motivating standard units

Teaching practices

  • Name the attribute before choosing a unit — length, mass, temperature or capacity — so the unit family and the instrument match what is being measured.
  • Teach grain choice explicitly: which unit gives a sensible, readable number for THIS object (cm for a pencil, m for a room), using benchmark sizes to judge.
  • Establish why standard units at all — contrast two children's hand-spans giving different counts — so children see standard units let everyone compare.
  • Give a mixed 'measuring station' across all four attributes so choosing (not just reading) is the practised act.
  • Introduce standard units once the need is understood; the progression warns that heavy early use of many varied non-standard units can actually interfere with grasping why standard units are needed.

Activities to try

  1. 1

    Measuring station: choose the tool and the unit

    Why it works: You first decide what kind of quantity you are measuring so the unit family and tool fit, then choose a unit grain that gives a sensible, readable number.

    1. Set out a mixed set of objects one at a time — a pencil, a table, an apple, a jug of juice, a cup of water (and, if available, something whose temperature matters) — with a ruler/tape, a kitchen scale, a measuring jug and a thermometer all available.
    2. For each object, first say out loud what KIND of measurement this is: how long? how heavy? how much fills it? how hot?
    3. Pick the matching instrument, then choose the standard unit (m or cm, kg or g, litres or ml, °C).
    4. Measure to the nearest mark and state the amount with its unit.
    5. Try a deliberate mismatch — measure the pencil in metres — and notice the number is useless (to the nearest metre a pencil rounds to '0 m'); then switch to centimetres and get a clean reading (a real pencil is usually somewhere between about 10 cm and 19 cm, depending on how much it has been sharpened).
  2. 2

    Why standard units at all — the hand-span contrast

    Why it works: Standard units let everyone agree and compare, because a non-standard unit changes from person to person.

    1. Measure the same object (e.g. a table) in hand-spans with two different people and record both counts — for example one person gets 8, another gets 9.
    2. Discuss why the two counts differ for the same table.
    3. Re-measure with a ruler in centimetres and compare: everyone gets the same number.
    4. Explain in your own words why we use standard units like centimetres instead of hand-spans or cubes.
  3. 3

    Sort objects to their sensible unit

    Why it works: Each attribute and each sensible size has a matching unit family and grain, which a benchmark size helps you judge.

    1. Sort a set of everyday objects under the unit you would use: m, cm, kg, g, litres, ml, °C.
    2. Answer targeted questions such as 'Which unit would you use to weigh an apple?' and justify the choice, rejecting a too-big option like kilograms in favour of grams.
    3. Pair each unit with a benchmark object (a metre stick, a 1 kg bag, a 1 litre bottle) and use the benchmark to sanity-check your sorting.

Topic // Standards

Curriculum standards

Codes for the curriculum statements this topic maps to. Each publisher owns its standard text.
The national curriculum in England: Key stages 1 and 2 framework document
Maths/Y2/M/1

Math // Measurement

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