加 用plus，and或add表示;
等于 用is，make，equal等词表示。
2+3=? 可表示为: How much is two plus three?
2+3=5
Two plus three is five.
Two and three is equal to five.
Two and three makes five.
Two added to three equals five.
If we add two to/and three, we get five.
减 用 minus或 take from表示
10-6=? How much is ten minus six?
10-6=4
Ten minus six is four.
Take six from ten and the remainder is four.
Six (taken) from ten is four.
十减去六等于四
乘 用time(动词)或multiply表示
3X4=? How much is three times four?
3X4=12
Three times four is/are twelve.
Multiply three by four，we get twelve.
Three multiplied by four makes twelve.
三乘以四等于十二
除 用divide的过去分词形式表示
16÷4=? How much is sixteen divided by four?
16÷4=4
Sixteen divided by four is four.
Sixteen divided by four equals/gives/makes four.
十六除以四等于四。
追问平方和开根号呢？
追答加：plus(动词）,addition（名词）
减：minus,subtracts(动词）,subtraction（名词）
乘：multiplies,times(动词）,multiplication(名词）
除：divided by(动词被动式）,division(名词）
开根号：root of
开平方：square
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