Oh, dude, making a 100 using 1234567 is like trying to fit a square peg into a round hole. But hey, if you really wanna go down that rabbit hole, you can add 1 + 2 + 3 + 4 + 5 + 6 + 7 + 8 + 9 + 10 + 11 + 12 + 13 + 14 + 15 + 16 + 17 to get 153, then subtract 53 to get 100. Voilà!
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7654321
100
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
That depends which place you want to round it to.
99 + 9(9 - 9)= 99 + 90 = 99 + 1 = 100