葛乾
一、小數(shù)表示法
A.小數(shù)用基數(shù)詞來表示,以小數(shù)點為界,小數(shù)點前的整數(shù)部分按數(shù)目整體讀,小數(shù)點后應一位數(shù)一位數(shù)來讀。小數(shù)點讀作point,0 讀作zero 或O,整數(shù)部分為零時,可以省略不讀。如:0.5 讀作zero(O) point five; 或point five,3.14 讀作three point one four.
B.當數(shù)字值大于1時,小數(shù)后面的名詞用復數(shù);數(shù)字值小于1時,小數(shù)后面的名詞用單數(shù)。如:
1.03 meters 1.03米 0.56 ton 0.56噸 6.8 tons 6.8噸
二、分數(shù)的表達法
A.分子用基數(shù)詞,分母用序數(shù)詞。分子大于1時,分母的序數(shù)詞要加“s”。如:讀作one third; 讀作two thirds;
2 讀作two and two thirds;
讀作twenty-four twenty-fifths
讀作 a half 或one half 表示;
可用one fourth,也可用a quarter 或one quarter表示;
B.在語句中表示“幾分之幾的……” 要與介詞of 連用,
的學生 one third of the students.
C.當分數(shù)后面接表示單位量的名詞時,如果分數(shù)表示的大于1,名詞用復數(shù);小于1,名詞用單數(shù)。如:
1 hours 一個半小時,2 meters 二又四分之三米
meter五分之四米
三、百分數(shù)表示法
百分數(shù)用“基數(shù)詞+percent” 表示,無論基數(shù)詞多大,percent 都不加-s。如:5%讀作five percent;
0.12% 讀作zero point one two percent
表示“百分之幾的……”要與of 連用。
如:30%的學生:
30% of the students 或thirty percent of the students
四、加減乘除表示法
A.“加“用plus表示“等于”用equals; is equal to; is; makes等詞表示。
2+3=?How much is two plus three?
2+3=5 Two plus three is (equals; is equal to; makes) five
B.“減”用minus 表示。
8-3=?How much is eight minus three?
8-3=5 Eight minus three is ( equals; is equal to ; makes) five
C.“乘”用times 或multiplied by表示。
3×3=? How much is three times three?
3×3=9 Three times three is (equals; is equal to; makes)nine.
Three multiplied by three is nine.
D.“除”用divided by 表示。
16÷4=?How much is sixteen divided by four?
16÷4=4 Sixteen divided by four is four.
五、一些計算式
(1) x2 讀作 x squared 或x to the second power 或the second power of x
32=9 Three squared is nine; The second power of 3 is 9;
Three to the second power is nine;
x3 讀作x cubed 或x to the third power 或the third power of x
33=27 Three cubed is twenty-seven;
Three to the third power is twenty-seven;
x4 讀作x to the fourth power 或the fourth power of x
34=81 Three to the fourth power is eighty-one.
(2) the second root of x 或the square root of x
=3 The second square root of 9 is 3;
=3 The third (cube) root of 27 is 3;
=3 The fourth root of 81 is 3.