V. Numerals, counters and numbers

C. Compounds that consist of a numeral and a counter are called numbers.
Numbers are considered nouns in Japanese but often act like adverbs.

Examples
1. Kyoo wa goji ni okimashita.
"Someone* got up at five o'clock today."
2. ichidoru wa nihyakunijuuhachi en desu.
"One dollar is 228 yen."
3. Kono kaban wa happyaku guramu desu.
"This bag weighs 800 grams."
4. Sono eega o sando mimashita.
"Someone* saw the film three times."
5. Gakusee ga sannin kimashita.
"Three students came."
6. Kami ga sanmai arimasu.
"There are three sheets of paper."
7. Niku o sanbyaku guramu kaimashita.
"I bought 300 grams of meat."
8. Kitte o juumai kaimashita.
"I bought ten stamps."
(*"Someone" may be the speaker.)