加减乘除乘方英语讲解.ppt

加、减、乘、除、乘方
+-×÷
The Expressions
+
add, plus, and
-
minus, take (subtract)...from...
×
times, multiplied by , multiply...by...
÷
divided by, divided...by...
X^
power(square, cube...)
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.
What’s three plus four? It’s seven.
subtraction 减
10-6=?
How much is ten minus six?
10-6=4
minus (prep), subtract (v.)
Ten minus six is four.
We also can use “take…from…”:
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.)
3×4=?
How much is three times four?
3×4=12
Three times four is twelve.
Multiply three by four, we get twelve.
Three multiplied by four makes twelve.
division 除
15÷5=?
How much is fifteen divided by five?
15÷5=3
Fifteen divided by five is three.
Fifteen divided by five equals/makes four.
Divide fifteen by five, we get three.