10 June 2008Add to My Folder
Make cross-curricular links to numeracy with these measurement activities for ages 7-11
Estimates of measures are educated guesses based on comparisons with quantities that we already ‘know’. For example, we might estimate the width of a book using a mental image of a 30cm ruler, the length of a room using rounded multiples of our own height, or the volume of water in a fi sh tank using an image of a litre carton of fruit juice. In order to develop their estimation skills, children need to explore, develop and internalise a number of their own mental images or ‘yardsticks’. They also need lots of practice, so that they can develop their spatial skills and improve upon their accuracy and consistency.
- What sort of mental images or techniques could you use when estimating counting seconds, for example ‘one Mississippi, two Mississippi…’?
- Does the degree of accuracy required for a ‘good’ estimate remain constant?
- What’s an acceptable range for an estimate of the width of this window or mass of this book or length of this pause?
- When would it be appropriate to estimate rather than measure?
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