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The HCF of two prime numbers is _____

The LCM of two prime numbers is their _____.

The greatest number which can divide $16,20$ and $24$ is _____.

The smallest number that is divisible by $8,10$ and $12$ is _____.

The HCF of two consecutive odd numbers is _____.

The HCF of two consecutive even numbers is _____.

The LCM of $18$ and $40$ are _____.

The LCM of $54$ and $216$ is _____.