Factor them.
2 x 3 x 3 = 18
2 x 3 x 5 = 30
Combine the factors, eliminating duplicates.
2 x 3 x 3 x 5 = 90, the LCM
The GCF of 18 and 3 is 3. If that's 18x3, you need another term to compare it with.
Make them additive for illustrative purposes.
18X3 + 30X5
6X3(3 + 5X2)
6X3
=====greatest common factor
The GCF is 6x3
The GCF is 6x^2
3x
9x2
6
6x3
The GCF is 3x
54
54.By the way, what does what and mean?
Eighteen times three is equal to 54.
2x^3(x - 3)(x + 3)
24x^5 + 24x^3 = 24x^3(x^2 + 1)
18x-3 = 15
The GCF is 6.
The GCF is 9.
The GCF is 4.
The GCF is 30.