A spreadsheet that will generate either a random target board or allows you to choose 3 numbers to base the board on. The bigger the numbers, the harder it will be. Get pupils to find for example 5 answers, as many as they can in 4 minutes, the hardest ways.... Numbers can only be used once in each answer. Make up your own rules about what mathematical functions are allowed such as powers and roots. Mini whiteboards work well.
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