Safe cracker

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In this STEM activity, pupils will solve three addition and subtraction problems, with the answers giving the digits needed to crack the code to a safe. This activity allows pupils to further their abilities to add and subtract numbers with up to three numbers mentally and using formal columnar methods and to solve missing number problems involving addition and subtraction. This activity could be used as a starter activity covering previous learning, a plenary activity reinforcing learning that has just taken place or as part of a wider scheme of learning focussing on addition and subtraction. This activity supports the Year 3 Maths curriculum and has been provided by the IEP (Institution of Engineering and Technology).

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Please be aware that resources have been published on the website in the form that they were originally supplied. This means that procedures reflect general practice and standards applicable at the time resources were produced and cannot be assumed to be acceptable today. Website users are fully responsible for ensuring that any activity, including practical work, which they carry out is in accordance with current regulations related to health and safety and that an appropriate risk assessment has been carried out.

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