《It costs one thousand eight hundred yuan》PPT课件
三位数：
200 two hundred
400 four hundred
百和十指间用”and”连接。
690---six hundred and ninety
729---seven hundred and twenty nine
四位数：
3,900---three thousand, nine hundred
4,500---four thousand, five hundred
5,609---five thousand, six hundred and nine
2,390---two thousand, three hundred and ninety
... ... ...
Advantages:
Easy to do homeworkeasy to find documentsaccess a lot of information on the Internet
Disadvantages:
Expensiveneeds electricity to work can break down access to bad or incorrect information
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