加减乘除乘方英语讲解ppt课件.ppt

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1、加、减、乘、除、乘方加、减、乘、除、乘方The ExpressionsThe Expressions add, plus, and minus, take (subtract).from. times, multiplied by , multiply.by. divided by, divided.by. Xpower（square, cube.）addition 加加3+4=？ How much is three plus four?3+4=7plus (prep.) add (v.) Three plus four is seven. Three and four makes seven

2、. 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.subtraction 减减106? How much is ten minus six?1064minus (prep), subtract (v.) Ten minus six is four. We also can use “takefrom”: Take (subtract) six from t

3、en,and the remainder is four. (remainder n. 余下的部分) Six taken (subtracted) from ten is four.multiplication 乘乘 Times (prep.) or multiply（v.） 34? How much is three times four?3412 Three times four is twelve. Multiply three by four, we get twelve. Three multiplied by four makes twelve.division 除除155? Ho

4、w 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.power 乘方乘方 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 powerExample: Three to the 8th

5、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 quarter 1 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 inchThank you!Thank you!