Cách sử dụng
The expression "add up" is used when talking about numbers or calculations. It means to add all the numbers together. For example, if you have three apples and then you get two more, you can say "Three apples plus two apples equals five apples. All the numbers add up to five." "Add up" can also be used to talk about a situation that doesn't make sense at first but becomes clear when you consider all the facts. For example: "I'm not sure why John is always tired, but it adds up when you find out he works two jobs and has two kids to take care of." So, "add up" can mean to add numbers together or to make sense of a situation when you consider all the facts.