Over the next weekend, Barrios says, she and her husband sat with their daughter for hours each day until she finished the multiplication lesson, even as she broke down and sobbed that she’d rather die than keep going. Ultimately, Barrios says she double-checked all the answers on a calculator before the 9-year-old entered them. But when the girl returned to school with the lesson completed, her mom says, she came back reporting crushing news: In the time she had spent stuck, she had fallen even farther behind her targeted goals.