一、number
短语
add a number 增加一个数字
calculate the number 计算数目
carry a number 进位
actual number 实际数目
例句
No, I don't know the room number
不，我不知道房间号。
We live at no. 107 Church Street.
我们住在教堂街107号。
You'd better take down my address and telephone number.
你最好把我的地址和电话号码记下来。
其他
第三人称单数：numbers
复数：numbers
现在分词：numbering
过去式：numbered
过去分词：numbered
二、figure
短语
figure out 计算出，解答出
例句
It would be very nice if we had a true figure of how many people in this country haven't got a job
如果我们能得到该国失业人口的真实数字就好了。
Please help me to figure out my income tax.
请帮我算一下我的所得税。
She has an attractive figure.
她有迷人的曲线。
其他
第三人称单数：figures
复数：figures
现在分词：figuring
过去式：figured
过去分词：figured
三、digit
例句
One digit always precedes the decimal point.
小数点前总有一个数字。
John's money quickly melted away as the double - digit inflation rate continued to soar.
随着两位数的通货膨胀率继续上升，约翰的钱很快就花光了。
She put a dressing on the mangled digit.
她包扎了被砍伤的脚趾。