加减乘除乘方英语讲解ppt课件.ppt

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1、加、减、乘、除、乘方,The Expressions,addition 加,3+4=？How much is three plus four?,3+4=7,plus (prep.) add (v.)Three plus four is seven.Three and four makes seven.equal v./adj.Three and four is equal to seven.Three added to four equals seven.If you add 4 to 3，you get 7.Whats three plus four? Its seven.,subtract

2、ion 减,106?How much is ten minus six?,1064,minus (prep), subtract (v.)Ten minus six is four.We also can use “takefrom”:Take (subtract) six from ten,and the remainder is four.(remainder n. 余下的部分)Six taken (subtracted) from ten is four.,multiplication 乘,Times (prep.) or multiply（v.） 34?How much is thre

3、e times four?,3412,Three times four is twelve.Multiply three by four, we get twelve.Three multiplied by four makes twelve.,division 除,155?How much is fifteen divided by five?,1553,Fifteen divided by five is three.Fifteen divided by five equals/makes four.Divide fifteen by five, we get three.,ower 乘方

4、,乘方、幂 power 二次方，平方 square 三次方，立方 cube 四次方 the power of four, the fourth power n次方 the power of n, the nth power,Example:Three to the 8th power（The 8th power of 3）3的8次方4 to the power of 3 is 4.4 的 3 次方是 4。,Some fractions 分数, three fourths; three quarters a half a/one quarter1 one and a half 3 three and one fourth; three and one quarter,Some examples:一个半小时： one and a half hours二又四分之三米： two and three-fourths meters五分之四英寸： four-fifths inch,Thank you!,