the difference between 增加了 and 增加到 if you want to live in China for some time, like going to the supermarket, or, doing some business, You will hear some of these idioms 增加了 增加到. They look like almost same. Don't worry, i think you can get it. it's just like [increase by]or[increase to] ●About [increase by] you will hear about 增加了 增长了 上升了 提高了 . But just one thing you need pay attention to：it does not include the original number, only refers to the net increase. Let's take an example, from ten to fifty, you can say 增加了四倍quadruple, It's [increased by] 400 percent ●And about [increase to], from ten to fifty, you can say 增加到五倍quadruple by →了，to →到. Are you clear？ Ok, That's all. If you have any questions, welcome to point out. Thank you.