1、It's the little minor problems that add up.
就是小问题才会累积。
2、The three accounts add up to 65,000 yuan.
这三笔账归并起来是六万五千元。
3、I added up the account items all over again in reverse order.
我把账目反过来又算了一遍。
4、They added up several columns of figures.
他们合计了几列数字。