表示数目的词称基数词。15 fifteen，几百几千不加s，242 two hundred and forty-two，5058 five thousand and fifty-eight，9，600，000 nine million six hundred thousand
6+8=14 Six plus eight is fourteen.
9-7=2 Nine minus seven is two.
7X5= 35 Seven times five is thirty-five.
8÷4=2 Eight divided by four is two.
He died in his fifties.
This took place in 1990s/1990s.
The professor became successful in his thirties.
1700 seventeen hundred
1814 eighteen fourteen
9：20 nine twenty
11：30 eleven thirty/ half past eleven
5：45 five forty-five/ a quarter to six
88760231 eight eight seven， six zero two， three one
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