Math // Measurement

Measuring mass and weight

Measure and begin to record mass/weight using non-standard and standard units

Ages
5 to 6
Type
Method
Builds on
1 topic
Leads to
1 topic
Standards
1 code

Quick check

If the learner uses balance scales to compare two objects, can they tell you which is heavier — and if given weights like 100g, can they balance an object on the scale?

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.
  • Use a balance to compare masses of two objects
  • Measure mass using non-standard units (e.g. 'this book weighs 5 cubes')
  • Begin to read a simple scale for mass

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

1 topic

You are here

Measuring mass and weight

Ages 5 to 6 // Method

Leads to

1 topic

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 move from comparing mass to quantifying it: expressing mass as a number of units — first non-standard (this book balances 5 cubes), then standard (grams, kilograms) — and reading a simple dial or scale. A balance shows equivalence (the object balances N identical units); reading a graduated scale means valuing the intervals, not counting marks. The key insight is that a larger unit gives a smaller count for the same object.

Common misconceptions

  • Uses non-identical units yet counts 'more units = heavier' (unit-size ignorance)
  • Reads a scale by counting marks rather than valuing intervals; misreads a pointer between graduations
  • Thinks the count itself is the mass regardless of which unit was used
  • Reads before the balance settles / uses a mix of unit sizes

Useful representations

  • Balance with identical unit-weights on one pan
  • Dial / kitchen scale with graduations
  • The number-line-like scale of graduations
  • The record: '5 cubes' or '200 g'

Teaching practices

  • Use a balance to find how many IDENTICAL units balance the object (equivalence), recording as number + unit ('5 cubes', '200 g')
  • Insist units are identical — mixing cube sizes breaks the count (the unit-size principle: a larger unit gives a smaller count)
  • When reading a dial/scale, first work out what one interval is worth, then count intervals (spaces) to the pointer, not the marks
  • Estimate first, then check by measuring
  • Keep it practical; wait for the balance beam to settle before reading

Activities to try

  1. 1

    Balance it with identical units

    Why it works: Mass can be quantified as a number of identical units that balance the object; the record is a number plus a unit, not just a number.

    1. Place a book (or other object) on one pan of a balance.
    2. Add identical unit-weights (e.g. interlocking cubes) one at a time to the other pan until the beam levels, or is as near level as you can get; if one more cube tips it the other way, the object is between two counts.
    3. Wait for the beam to settle before reading, then count the cubes and record the result as a number with its unit, e.g. '8 cubes', or 'about 8 cubes' / 'between 8 and 9 cubes' if it never quite levels.
    4. Before you start adding cubes, check every cube is the same size; set aside any odd-sized ones.
    5. Before adding any cubes, estimate how many you expect; after measuring, compare your estimate with the measured count.
  2. 2

    Same book, different unit size

    Why it works: A larger unit means fewer units are needed to balance the same object; the count changes because the unit changed, not because the mass changed. Conversely, smaller units give a larger count.

    1. Measure the SAME book again, this time using larger unit-weights.
    2. Count how many large units balance the book and compare with the earlier count of small units.
    3. Say aloud why the number is different even though the book has not changed.
    4. Discuss: can both counts be right at the same time — for example '5 big cubes' and '12 small cubes' for the same book? Explain how.
    5. Place one large unit on one pan and add small units on the other until it balances, or is as close as possible — count about how many small units equal one large unit.
  3. 3

    Read the dial by valuing the intervals

    Why it works: A graduated scale is read like a number line: establish the value of one interval, then count intervals to the pointer — this is the same skill as reading a ruler.

    1. Look at a dial or kitchen scale marked at regular intervals (e.g. a mark every 100 g).
    2. First work out what ONE interval is worth, e.g. the gap between two marks is 100 g.
    3. Count the intervals (the spaces) from zero up to the pointer, not the marks, to find the mass — e.g. three intervals of 100 g means 300 g.
    4. Read to the nearest graduation when the pointer falls between two marks.
    5. Explain how you knew each mark meant 100 g and not 1 g.

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/Y1/M/6

Math // Measurement

More in Measurement

All 68 topics