≌

　　congruent ['kɒŋgrʊənt] to，全等(两个图形形状相同、大小相等)，“△ABC≌△DEF”读作：Triangle ABC is congruent to Triangle DEF.

　　≈

　　approximately equal to 约等于号，“3×3≈10” 读作：Three multiplied by three is approximately equal to ten.

　　<

　　is less than 小于号，“1<2”读作 One is less than two.

　　>

　　is greater than 大于号，“2>1”读作：Two is greater than one.

　　≤

　　is less than or equal to 小于或等于号，“2≤3”读作：Two is less than or equal to three.

　　≥

　　is greater than or equal to 大于或等于号，“5≥4”读作：Five is greater than or equal to four.

+

　　plus 加号;正号，“1+1”读作：one plus one

　　-

　　minus ['maɪnəs]; negative ['negətɪv]，减号;负号，“2-1”读作：two minus one，“-3”读作：minus three或negative three，“2-(-3)”读作：two minus negative three

　　±

　　plus-minus sign 正负号，“±1” 读作：plus or minus one

　　×

　　multiplied [’mʌltɪ’plaɪd] by ; times，乘号，“2×3” 读作：two multiplied by three 或 two times three

　　÷

　　divided by 除号，“4÷2”读作：four divided by two

　　=

　　equals; is equal to 等于号，“1+1=2”读作：One plus one equals two. 或 One plus one is equal to two.

%

　　percent 百分之……，“10%”读作：ten percent

　　∞

　　infinity [ɪn'fɪnɪtɪ] 无限大号，“-∞” 读作：negative infinity

　　square root 平方根，“ =4”读作：The square root of sixteen is four.

　　cube root 立方根，“ =3”读作：The cube root of 27 is 3.

　　∵

　　since; because 因为，“∵1+1=2”读作：because one plus one equals two

　　∴

　　hence; therefore 所以，“∴1<2”读作：hence one is less than two

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