30, 20, 45, 20, 45, 15, 20, 55, 20, 15, 40, 30, 50, 20, 35, 50, 40, 35, 15, 35, 35, 25, 50, 45, 30, 45, 25, 25, 25, 15, 15, 40, 20, 20, 35, 35, 30, 53, 10, 25, 10, 10, 40, 10, 40, 10, 35, 25, 15, 20.
Which number is the odd one out? Write down as many reasons as you can think of explaining why that number is the odd one out.
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Note to teacher: Doing this activity once with a class helps students develop strategies. It is only when they do this activity a second time that they will have the opportunity to practise those strategies. That is when the learning is consolidated. Click the button above to regenerate another version of this starter with different numbers.
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