Must not mention slavery in mathematics homework

We read:

"An Atlanta elementary school teacher has resigned amid a growing furore over mathematics homework that involved questions concerning slavery.

The third-grade maths problems - which featured such questions as: 'If Frederick got two beatings each day, how many beatings did he get in one week?' - sparked outrage among parents connected with the school, and led to a wider investigation in Gwinnett County in Georgia.

Gwinnett County schools spokeswoman Sloan Roach confirmed that a suburban Atlanta teacher had resigned over the homework at Beaver Ridge Elementary School in Norcross, and a further three were still under investigation.

She says the school system accepted the resignation of the teacher but declined to elaborate on the rest.

Parents were angered by the maths problems, and the National Association for the Advancement of Colored People (NAACP) had called for the teachers responsible to be fired.

Among other questions deemed offensive in the third-graders' homework, one read: 'Each tree has 56 oranges. If eight slaves pick them equally, then how much would each slave pick?"

A third said: 'Susan B Anthony was fined $100 for voting for president. She only had $25, how much more did she need to pay the fine?'

School officials said it was an attempt to mix social studies with mathematics, but parents were horrified when their children brought the questions home.

The school has claimed that papers containing the offending mathematics problems have since been destroyed to prevent their future use.

Source

I gather that kids are normally taught in school how evil Whitey is because of the slavery era so past slavery is hardly a secret that must not be mentioned