We've had a few scavenger hunts, where we have been estimating different lengths and looking for classroom objects which are that length. At first it was difficult, but we found ways to estimate using body measurements.
For example, some of us discovered that our index finger was approximately 10cm long.
We also did some estimating outside, using our paces to measure distance in metres.
Some of us got really good at this and were able to estimate very closely to the actual measurement.
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