Common factors of 15 and 18 are: 1 and 3.
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Highest common multiple of 24 and 18 is 6.
The highest common factor of 10 and 18 is 2.
The common factors of 18 and 36 are 18,9,6,3,2,1.
Factors of 18 are 3,3,& 2. Factors of 21 are 3 & 7 One lot of '3' is common to both so '3' is the HCF.
The GCF of 18, 24 and 32 is 2.