This sort of thing strikes fear in the heart of every administrator. So, I let them customize their lessons and they come up with word problems about how many times a slave would be beaten in a minute at a certain rate.
It is offensive on so many levels but also because we see an uproar over slavery in words (in this worksheet) but not in deeds. Fact is, there are 29 million slaves in the world today, more than ever in history and they are being beaten and forced to work. We don't see an uproar over that and we should. Both the worksheet and the bigger problems deserve attention.