+: plus 加号；正号

“1+1”读作：one plus one

－: minus; negative 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 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.

≠: is not equal to 不等于号

“a≠b”读作：a is not equal to b

≌: congruent 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 not less than 不小于号

“3≮2”读作：Three is not less than two.

≯: is not greater than 不大于号

“2≯4” 读作：Two is not greater than four.

≤: 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.