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do the prime factorization of the 3 numbers. list the prime factors of all the 3 numbers. circle the factors that are common to the 3. multiply them. that number is the HCF
Prime numbers have only 2 factors which are themselves and one whereas composite numbers have more than 2 factors
The answer depends on which numbers are in the grid!
There is no quick way to work out if a number is prime or not, the only way is to see if it can be divided by any numbers that aren't itself or one.
There is no simple way. The difficulty wit prime numbers is that there is no pattern.