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 estimate a division problem, share their methods, discuss the nice numbers and factors method, and then do more problems using nice numbers and factors.
Students calculate the number of free gifts distributed at a Tennis Championship given the number of people entering and the frequency of the gifts given away.
Choose which toy vehicle will roll further, and explain why. The two vehicles are set up under different conditions (ramps at different slopes, rolling onto different surfaces at the bottom). Assessment focus: science explanations using ideas about forces and energy.
Task: Answer questions about a table comparing the energy usage and lifespan of different sorts of lights, and use this information to complete a second table to describe advantages and disadvantages of each. Assessment focus: reading a technical table.