The math doesn't add up

If Detroit lost about 1 million people, a quarter of its population, then that means its population was once roughly 4 million. However, the article later says that the population has dropped below 750,000.

Also, the mayor's math is a bit off: If the population is 713,777 according to the latest census, the 35,000 people he says were not counted is still not enough to save the city. If they were all counted, there would be 748,777 people. It'd need to be slightly more than that,

You're quite right. The article misstated what happened. The population *was* about 1 million, and has now dropped to ~750,000.

Fixed now, btw.