Students are asked, in this resource from Defence Dynamics, to consider the importance of approximating and checking strategies in mental calculations and also of answers derived from a calculator. At each point they weigh up their answers against real-life results where unexpected factors have had to be taken into account. Students take on the role of evacuating British civilians from Lebanon and are given the limits within which they have to work. They then have to formulate a contingency plan for when circumstances change. The activity includes an opportunity for students to present their findings.
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