1. 加法：加法运算通常用and, plus, add 等表示。如：Seven and [plus] eight is [are, make(s)] 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 (away) (from) 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。(D8)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。
挪威森林北辰星
