Example: 30 and 42
List the factors.
1,2,3,5,6,10,15,30
1,2,3,6,7,14,21,42
Select the common factors.
1,2,3 and 6, the GCF.
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Both 10 and 20 are two-digit numbers that are factors of 20.
95
20 and 30 All numbers have at least one common factor.
They are 3-digit positive integers.
The number 32 has only one prime factor: 2The true prime factor for any number is 1.