25 wt% 　　　twenty five weight percent

150 oC 　　　one fifty degree C

1/2 　　　　　one half

1/3 　　　　　one third

2/3 　　　　　two thirds

4/5 　　　　　four fifths/ four over five

1.23 　　　　one point two three

0.01 　　　　zero point zero one

2.X 　　　　two point something

= 　　　　　is equal to / equals

>　　　　　 is larger than

< 　　　　　is less than

>> 　　　　　is much greater than

a = b + c 　　　　　a is equal to b plus c

a = b - c 　　　　　a is equal to b minus c

a = b x c 　　　　　a is equal to b times c / a is equal to b multiplied by c

a = b/c 　　　　　　a is equal to b divided by c / a is equal to b over c

x2 　　　　　　　　　x square / x to the second power / x to the power two

x3 　　　　　　　　　x cube / x to the third power / x to the power three

lognX 　　　　　　　log x to the base n

a* 　　　　　　　　　a star

a’ 　　　　　　　　a prime

a’’　　　　　　　 a double prime

// 　　　　　　　　is parallel to