Securing understanding of rounding
I can recognise when values have been rounded and state sensible suggestions of what the unrounded value could have been.
- Year 8
Securing understanding of rounding
I can recognise when values have been rounded and state sensible suggestions of what the unrounded value could have been.
Lesson details
Key learning points
- When a number has been rounded you can make conjectures about what the unrounded number could have been.
- Rounding can be very useful in real life contexts particularly measure.
- When working in some real life contexts you are often working to a certain degree of accuracy.
- Numbers in different contexts will be rounded to a different degree of accuracy (e.g. distance when walking or flying).
Keywords
Conjecture - A (mathematical) statement that is thought to be true but has not been proved yet.
Degree of accuracy - A degree of accuracy shows how precise a number or measurement is. E.g. to the nearest cm, nearest 10, 1 d.p., etc.
Common misconception
The assumption that if a number ends in 2 zeros it must have been rounded to the nearest hundred.
Choose examples that round to the same value when rounded to the nearest ten and hundred in this case. E.g. 398, rounds to 400 to the nearest ten and 400 to the nearest hundred.
Equipment
Licence
Lesson video
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