1.加法：加法运算通常用and,plus,add 等表示.如：Seven and [plus] eight is [are,make] fifteen.7加8等于15.If you add ten to eight,you get eighteen.10加8等于18.2.减法：减法运算通常用 minus,from,take 等表示.如：Eight minus five is [leaves] three.8减 5等于3.4 from 20 leaves 16.20减4余16.Ten take away four is [leaves] six.10减去4得6.If you take five from twelve,you’re left with seven.12减去5得7.If you take four away from ten,that leaves six.10减去4得6.3.乘法：乘法运算通常用 times,multiplied by,twice 等表示.如：Five times three is [equals] fifteen.5乘以3等于15.Five multiplied by two equals ten.5乘以2等于10.What is twice two?2乘2是多少?4.除法：除法运算通常用 divided by,into 等表示.如：Twelve divided by four is [makes] three.12除以4等于3.Four into twelve is [makes] three.12除以4等于3.
