4 and 5 because the square root of 18 is about 4.242640687
3 and 18
20
There are no mixed numbers between 0 and 2 with an interval of 18.
Nine: 18, 20, 21, 22, 24, 25, 26, 27, 28
4 and 5 because the square root of 18 is about 4.242640687
They are: 18 and 19
6 and 9 are one pair of numbers with a common multiple of 18. Another pair are 9 and 18.
They can be 18 and 27
3 and 18
9 and 18
20
6 (six)
9 and 18
20
1 and 180 are one possible pair.
The GCF of 18 and 32 is 2.