3 of them.
The multiples of five between sixty and ninety (inclusive) are 60, 65, 70, 75, 80, 85 and 90.
50, 60, 70, 80, 90
65, 70, 75, 80, 85.
You need at least two numbers to find an LCM. The multiples of 9 between 70 and 105 are 72, 81, 90 and 99.
50, 60, 70, 80, 90, and 100.
65, 70, 75, 80, 85, 90 and 95.
There are 10 multiples of 10 between 1 and 100: 10, 20, 30, 40, 50, 60, 70, 80, 90, and 100.
They are: 20, 30, 40, 50, 60, 70, 80, 90, 100.
10, 20, 30, 40, 50, 60, 70, 80, 90, 100
70 and 90
70 and 90