78、 12345、 230、 9:15的英文怎么拼写?急！

78 seventy-eight
12345 twelve thousand three hundred and forty-five
230 two hundred and thirty
9:15 a quarter past nine 或者 nine fifteen

78: seventy-eight;
12345: twelve thousand three hundred and forty-five;
230: two hundred and thirty;
9:15: nine fifteen 或者 a quarter past nine 或者 fifteen past nine

这是数字吗？seventy-eight，twelve thousand three hundred and forty-five，two hundred and thirty，nine fifteen