This isn't done by an equation.
Start dividing 100 / 7. Since this won't give you an integer, round the result up. Now multiply this result by 7, to get a multiple of 7. Add 7 to the result, then add 7 again, and again, until you get over 200.
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The common multiples of a number with itself are the multiples of that number. Thus all multiples of A between 1 and 100 are the common multiples of A and A between 1 and 100.
what are the common multiples of 7 and 11 between 1 and 100
They are all multiples of 1.
The multiples of 10 between 100 and 200 are 100, 110, 120, 130, 140, 150, 160, 170, 180, 190, and 200
5,10,15,20,25,30,35,40,45,50,55,60