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28 and 29. In this kind of question, the quickest route is to take the square root (so that's two equal numbers that multiplied together give the right answer) and then your answer is the pair of numbers one on each side of that. eg for 20 the root is approx 4.47 , so try 4 x 5. Sometimes there is not such a pair of (whole) numbers - it only works if 1 plus4 times your number is a perfect square ( and 1 + 4x812 is a perfect square).

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Q: What are the two consecutive numbers that have a product of 812?
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