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point
What's the song about ?
Play a game about numbers
任意指定一个学生开始说one，然后依次让第二个two说，第三个说three…说到seven,seventeen…或七的倍数(如fourteen,twenty-one等)时，就不报数而用拍手代替。如果你说错了或者动作做错了，课后请自觉唱一首歌。
220
222
two hundred and twenty
two hundred and twenty-two
十位与百位间用 “and”。
个位与十位间一般要用连字符号“-”,
billion
million
thousand
one billion, two hundred and thirty-four million, five hundred and sixty-seven thousand, eight hundred and ninety one
comma
逗号
1, 234, 567, 891
Watch and discuss how to read large numbers .
朗读数字时，从后往前将每三位数看做一个单位用逗号隔开。
倒数第一个逗号读thousand，倒数第二个逗号读million，倒数第三个逗号读billion。
每个单位按照百、十、个位往后读，
遵循百位以内数字的读法。
8,742
1,370,000,000
2,000,030,000
one hundred and thirty-one point four billion
two billion and thirty thousand
eight thousand, seven hundred and forty-two
one billion, three hundred and sevevty million
1.37billion