[gjm11]

The source you cite does not support the claim you make. Indeed, it pretty much refutes it.

1. It says there were 10.4M "working poor" in the US out of a total of 46.2M "poor", and that the latter number includes children.

2. I haven't found explicit absolute numbers for child poverty in the US, but the figure seems to be somewhere around 15M. That would mean about 30M poor people who aren't children, of whom about 10M are "working poor" and therefore about 20M are not working despite being of working age. No matter how you slice it, 2/3 is not "about 80%".

3. But there's more. You said not "don't work" but "choose not to work". Now, indeed the "working poor" as defined in that report include people who were officially classified as looking for work as well as those who were actually working. But, e.g., poor people who are unable to work because of illness or disability will not be included in that number. Would you say that they "choose not to work"?