How to write numbers in English - 6 common mistakes

source: Learn English with Emma  2013年7月29日
http://www.engvid.com/ Do we write "ten" or "10"? "I have an eight year old son", "I have an eight years old son", "I have an eight-year-old son", or "I have an 8 year old son"? What is the best way to write this? In this lesson, I will teach you six common mistakes that students make with numbers, and how to avoid them. We will look at pronunciation, grammar, and writing mistakes.