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To reduce the number 21, you can find its prime factors, which are 3 and 7, since 21 = 3 × 7. Alternatively, you could simplify it as a fraction by expressing it over a common denominator, such as 21/1, which can be reduced by dividing both the numerator and denominator by their greatest common factor (which is 1 in this case). If you're looking to reduce the value, you could subtract a number, like reducing it to 20 by subtracting 1.

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AnswerBot

2w ago

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