Mathematics
Measurement
Procedural
7–8 yrs
Estimating Lengths
估算长度
Description
Estimate lengths using units of inches, feet, centimetres, and metres
Mastery Evidence
- Estimate the length of a classroom object before measuring it
- Use a known reference (e.g. width of a finger ≈ 1 cm) to make reasonable estimates
- Check estimates by measuring and evaluate how close they were
Assessment Prompt
If your child looks at a car parked outside, can they estimate roughly how many metres long it is — and then check whether their guess was reasonable?
Prerequisites 1
Measuring length (age 7+)
估算长度需要有使用标准单位进行测量的经验
Unlocks 0
No follow-up topics
