By factoring them.
2 x 3 x 3 x 3 = 54
2 x 3 x 3 x 5 = 90
Select the common factors.
2 x 3 x 3 = 18, the GCF
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HCF(160, 90) = 10.
It is: 2
There is no highest common multiple of any two or more numbers, for whatever multiple is stated, their LOWEST common multiple can be added to get an even higher common multiple. However, there is a highest common FACTOR (HCF) which is the largest positive number that divides all the numbers without a remainder, and a LOWEST common multiple (LCM) which is the smallest number into which all the numbers divide without a remainder. For 108, 54, 90: hcf(108, 54, 90) = 18 lcm(108, 54, 90) = 540
The GCF of 60 and 90 is 30.
The GCF of 54, 90, and 126 is 9