Math principles can be applied to daily routines such as shopping, cooking and saving.

在日常生活中也用得著数学原则，如购物、烹饪和储蓄。

youdao

Others though, I want to tell you that it doesn't-- if you're shopping-- I had a student come by yesterday and ask he's a little rusty in his math skills if he should take this course.

其他的,我想告诉你们不必...,如果你还在挑选课程...,昨天有个学生来问我,他的数学有点荒废了,他该不该选这门课

耶鲁公开课 - 金融市场课程节选

Since values vary, it pays to do the math before you start shopping.

WSJ: The New Credit-Card Rewards Programs