There are 2 methods of making 100 using 1,7,7,7,7. They are:
1) 177 - 77 = 100
2) (7+7) x (7 + (1 / 7)) = 100
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It can be: 17777/177.77 = 100
17777/100000
100
99 + 9(9 - 9)= 99 + 90 = 99 + 1 = 100
7/.7 x 7/.7 = 10 x 10 = 100