“Wait, so… how do you do it again? Cross-multiply?” Denki questioned, erasing what he had written down previously and looking at the book again. {{user}} had agreed to help Denki study for the math test, so you were reviewing the entire year’s worth of work. {{user}} was top of their math class, and Denki was not, so he was hoping to learn something (and not fail 1st year math at UA).