Measuring length
Order three objects by length and compare the lengths of two objects indirectly using a third object
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Teaching Table
Set out your lesson
Order three lengths and use a third object as an indirect comparison tool.
Align two endpoints when comparing lengths; do not infer length from vertical position alone.
Directed source edges are preserved, not assumed completed. If the readiness probe is difficult, model with support and record supported practice instead of independent evidence.
Use the supplied stage-specific structured materials. Three paper strips and a non-stretch string/paper strip long enough to transfer a real object's height. Optional actual objects; supplied length-comparison.svg supports diagram reasoning.
Show, guided, put teaching sheet aside, then task sheets in order; adult keys remain private.
No printing or cutting is required unless explicitly choosing a physical construction. Exact paper alternatives are in each material; adaptations change the evidence mode as stated.
Materials are ready in each step. Use them on screen or print just the current step. Put teaching examples aside before the learner tries.
What this lesson covers and its limits
These are bounded opportunities, not learner attainment. Partial and blocked source requirements remain so.
- partial: Order three objects by length and compare the lengths of two objects indirectly using a third object
Real indirect comparison conditional. Source pencil/ribbon variations sampled through diagrams and one optional observation, not claimed as completed. This is a bounded task opportunity, not established attainment or automatic use across contexts.
- partial: Put three ribbons in order from shortest to longest
Mapped task(s) offer this clause only within the supplied examples. Real indirect comparison conditional. Source pencil/ribbon variations sampled through diagrams and one optional observation, not claimed as completed. No attainment or automatic/general performance is claimed.
- partial: Use a piece of string to compare the heights of two objects that cannot be placed side by side
Mapped task(s) offer this clause only within the supplied examples. Real indirect comparison conditional. Source pencil/ribbon variations sampled through diagrams and one optional observation, not claimed as completed. No attainment or automatic/general performance is claimed.
- partial: Explain that if A is longer than B and B is longer than C, then A is longer than C
Mapped task(s) offer this clause only within the supplied examples. Real indirect comparison conditional. Source pencil/ribbon variations sampled through diagrams and one optional observation, not claimed as completed. No attainment or automatic/general performance is claimed.
- partial: If {{name}} has three pencils of different lengths but can only compare two at a time, can they figure out which is longest — by using a third pencil as a go-between?
Real indirect comparison conditional. Source pencil/ribbon variations sampled through diagrams and one optional observation, not claimed as completed. This is a bounded task opportunity, not established attainment or automatic use across contexts.
Real indirect comparison conditional. Source pencil/ribbon variations sampled through diagrams and one optional observation, not claimed as completed.
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Teaching approaches
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1 approach
Order three lengths and use a third object as an indirect comparison tool.
Order three lengths and use a third object as an indirect comparison tool.
Family records and proof options
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Learning resources
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Check understanding
- Put three ribbons in order from shortest to longest
- Use a piece of string to compare the heights of two objects that cannot be placed side by side
- Explain that if A is longer than B and B is longer than C, then A is longer than C
“If your child has three pencils of different lengths but can only compare two at a time, can they figure out which is longest — by using a third pencil as a go-between?”
Curriculum record
- Type
- Procedural
- Subject
- Mathematics
- Domain
- Measurement
- Age range
- Ages 6–7
Standards