Greatest common factor of 21 and 28

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A prime number is a positive integer greater than one with exactly two positive divisors. Source: Prime number ↗

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24Least common multiple of 6 and 15RECALL
30
The smallest shared multiple
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25Greatest common factor of 36 and 48RECALL
12
The largest shared factor
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01First prime numberRECALL
2
The only even prime
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