There is a book on math problems in the second grade of primary school. I read 8 pages a day and finished it in 9 days. How many pages are there in this book? Think about it? Read 9 pages a day, reading more than I * * * have: 8×9=72 pages.

It takes 72÷9=8 days to read 9 pages a day, so there are few days.

PS:

If you don't learn division, look at the first question: If you read 8 pages in 9 days every day, then 9 pages every day must be 8 days.

Just like: 8×9=9×8.

The more pages you read every day, the fewer days you need.