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Following up on @Earlien answer I think the trick is to
decompose 420109 as 4 20 10 9 and read it in frenchFrench
This gives
99 = 4*20 + 10 + 9 which is one unit less than 100
Similarly
420108 would read as 98
decompose 420109 as 4 20 10 9 and read it in french
decompose 420109 as 4 20 10 9 and read it in French