3 of them.
They are: 70, 77, 84.
The multiples of five between sixty and ninety (inclusive) are 60, 65, 70, 75, 80, 85 and 90.
There are 10 multiples of 10 between 1 and 100: 10, 20, 30, 40, 50, 60, 70, 80, 90, and 100.
65, 70, 75, 80, 85.
50, 60, 70, 80, 90
You need at least two numbers to find an LCM. The multiples of 9 between 70 and 105 are 72, 81, 90 and 99.
70 and 90
65, 70, 75, 80, 85, 90 and 95.
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
There is only one. It is 70.