1、Numbers,数字,Who creates numbers,Arab ancient Indians Chinese ancient Egyptian ancient Babylonians,序数词,zero, one, two, three, four ,five, six, seven, eight, nine, ten, eleven, twelve thirteen, fourteen, fifteen, sixteen, seventeen, eighteen, nineteen twenty, thirty, forty, fifty, sixty, seventy, eight
2、y, ninetyhundred, thousand, million, billion,Have a Try（1）,310,900 2,501,198 three hundred and ten thousand, nine hundred two million, five hundred and one thousand, one hundred and ninety eight 73,021,112 5,008 seventy three million, and twenty one thousand, one hundred and twelve five thousand and
3、 eight,Have a Try（2）,one thousand and two five hundred and thirty three million, and forty six thousand, and one 1,002 533,046,001 eighty nine million, five hundred and twenty two thousand, six hundred and ten seventy three thousand, three hundred and thirty nine 89,522,610 73,339,小数 关键词：point,0.25
4、(zero) point two five 3.81 three point eight one 9.211 3.2901 9.8 5.333,分数（分子用基数词，分母用 序数词）,1/6 one sixth 5/8 five eighths 3/5 6/7 1/9 注意：1/2= one half= one quarter,加减乘除,Plus Minus Multiply Divide Equal,加减（plus and minus),3+2=5three plus two is/equals five6+5=11six plus five is/equals eleven 5-3=2fiv
5、e minus three is/equals two11-6=5eleven minus six is/equals five,乘除 (multiply and divide),4X2=8four multiplied by two is eight3X3=9three multiplied by three is nine 8/2=4eight divided by two is four9/3=3nine divided by three is three,Is your turn,7+8=15 600+30=630 60-4=56 49-9=40 50X2=100 15X4=60 48/4=12 90/3=30,
