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Someone out there may know a 'correct' way to do this, but I worked it out by ignoring the 'tens' and taking a look at the 'units'. I did this because it makes it easier to do mental arithmetic and because for the number to be 100, the adding some of the units and subtracting others has to come to zero.
17 June 2011
17+17+17+17+16+16
11 November 2020
try to first as many digit as you can to get a 100
19 October 2023
16+16+17+17+17+17=100
15 April 2024
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