สี่ ร้อย
“สี่ ร้อย” (си рой) — four hundred in Thai. Numeral, level A1, topic — basic words. Sii roi — four hundred. People sidestep fours here: the unlucky sii drags along behind the hundred, and a fourth hundred is avoided in prices. In a live sentence: “เด็ก สี่ ร้อย คน ไป โรง เรียน” — Four hundred children go to school. Written with the characters ส, ี, ่, ร, ้, อ, ย. One of 309 words in the set “basic words” in the Thai course.
In short
| Written in Thai | สี่ ร้อย |
| Read in Latin letters | си рой |
| Translation | four hundred |
| Part of speech | numeral |
| Level | A1 |
Why it looks that way
Sii roi — four hundred. People sidestep fours here: the unlucky sii drags along behind the hundred, and a fourth hundred is avoided in prices
A word with a story stays in memory longer than one learned as a “spelling — translation” pair: memory holds on to meaning, not to a string.
In a live sentence
A single word almost never appears alone in conversation. A sentence shows where it fits and what stands next to it.
- เด็ก สี่ ร้อย คน ไป โรง เรียนдек си рой кхон пай ронг рианFour hundred children go to school
Nearby words: basic words
Yes, no, good, bad, very. The small change of a language — and no sentence assembles without it.
- ใช่чайyesThe answer to a "...isn't it?" question. It sounds exactly like the word for tea — the easiest memory hook there is. It does not attach to verbs: to "going?" Thai answers "going"
- ไม่ ใช่май чайnoLiterally "not so". It negates nouns and facts; verbs are negated differently — a plain mai in front of the word. In casual speech people also answer plao
- สบายดีсабайдиfineLiterally "comfortable". The standard full answer about yourself: sabai di khrap khopkhun — fine, thank you
- ไม่ค่อย สบายмайкхой сабайnot so wellLiterally "not quite well". Thai avoids a flat "bad" about oneself and softens it; about illness the same move: mai sabai means "I am ill"
- เยี่ยม มากйиам макgreatA stronger answer to "how are you?" than sabai di: literally "on great form". Mak is the same "very" as in "thank you very much"
- ได้ ไหม?дай май?may I?; is it possible?Literally "can or not?". It attaches to any request at the end: kho nam dai mai — "water, may I?". The answer is dai (may) or mai dai (may not)
- และлэandA bookish link that live speech often drops: "coffee tea" without "and" sounds fine. In a list Thai more often puts a pause than the word
- แต่тэbutThe colloquial "but", standing between phrases. A second "but", tae wa, is longer and even more colloquial; the difference is tempo, not meaning
- กิโลкилоkilo; kilogramThe short form of "kilogram". Half a kilo is khrueng kilo, and "one and a half" is the other way round — kilo khrueng: the half jumps to the end
- ครึ่งкхрынгhalfA half; it stands in front: khrueng kilo — half a kilo, khrueng chua mong — half an hour
Test yourself
Five questions from the same set — “basic words”. Recalling a spelling from meaning is harder than knowing a familiar word on sight, and therefore more useful.
- How do you say “four hundred” in Thai?
Sii roi — four hundred. People sidestep fours here: the unlucky sii drags along behind the hundred, and a fourth hundred is avoided in prices
- How do you say “and” in Thai?
A bookish link that live speech often drops: "coffee tea" without "and" sounds fine. In a list Thai more often puts a pause than the word
- How do you say “fine” in Thai?
Literally "comfortable". The standard full answer about yourself: sabai di khrap khopkhun — fine, thank you
- How do you say “half” in Thai?
A half; it stands in front: khrueng kilo — half a kilo, khrueng chua mong — half an hour
- How do you say “may I?; is it possible?” in Thai?
Literally "can or not?". It attaches to any request at the end: kho nam dai mai — "water, may I?". The answer is dai (may) or mai dai (may not)
How not to forget this word
Reading a word and remembering it are different jobs. A day later, little survives of a single reading — and that is not bad memory, that is how memory works.
- This has been tested on foreign words too. The difference shows up most when you test yourself a few days later rather than straight away.checked many timesKim & Webb, 2022, Language Learning 72(2) · 48 experiments, 3,411 participants, 98 comparisons.
- Recalling beats re-reading. Covering the translation and trying to remember it does more than reading it ten more times.checked many timesAdesope, Trevisan & Sundararajan, 2017, Review of Educational Research 87(3) · 188 experiments, 272 comparisons. g = 0.61; against plain re-reading 0.51, against passive review 0.93.
- An answer you worked out yourself sticks better than one handed to you.checked many timesBertsch et al., 2007, Memory & Cognition 35(2) · 86 studies, 445 comparisons, d = 0.40.
Frequently asked
How do you say “four hundred” in Thai?
«สี่ ร้อย», read “си рой”. In a live sentence: “เด็ก สี่ ร้อย คน ไป โรง เรียน” — Four hundred children go to school. Numeral, level A1, from the set “basic words”; written with the characters ส, ี, ่, ร, ้, อ, ย.
How is “สี่ ร้อย” written in Latin letters?
си рой. This is a practical spelling — you need it to read aloud and be understood, not to meet an academic standard.
Why does this word look the way it does?
Sii roi — four hundred. People sidestep fours here: the unlucky sii drags along behind the hundred, and a fourth hundred is avoided in prices. A word with a story stays in memory longer than a “spelling — translation” pair: memory holds on to meaning, not to a string.