Students discuss making an interval estimate in multiplication problems (i.e., getting a lower and an upper limit for the actual answer using the front-end and rounding-up estimation methods). They then use this method on two problems.
Students write down an explanation of how the front-end estimation strategy works in addition problems to give information on their understanding of the strategy.
Students calculate the lengths of circles and straight lines on an oval athletics track from its given radius and total length, and show their working.