you needn't give me the very precise figure,a rough figure will be ok!
there's no need for you to give me an accurate figure/number(最好加上连接词 and )an approximate one will do.
You don't have to give me an accurate figure but just a ballpark figure.
ballpark figure = rough figure 粗略的数值
是商务场合中常用的习语,来源于棒球运动项目(任何击球只要不出场地的边界,都是允许的)
don't have to = don't need to 不需要...
You don't need to give me a very precise figures, probably a number can be.
You do not need to give me a very precise figure. Just a number on it is ok.