Xiao Hong read a story book. On the first day, she read 1 / 3 of the whole book. On the second day, she read the remaining 1 / 3 of the whole book. She still had a few parts of the book to read

I have done this question:
1-1 / 3 (one third) - 1 / 3 (1-1 / 3) = 4 / 9
There are still four ninths left
Please verify it yourself. I haven't done it for a long time. If it's wrong, it's not good
Are you a primary school dropper or a junior one?

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