Como Que Escreve 100

Writing the Number 100 in Portuguese

Most people asking this question are trying to figure out whether "cem" and "cento" are interchangeable when writing out numbers. They're not. This is one of those small grammatical details that trips up even decent Portuguese writers, especially when dealing with compound numbers or financial documents. The direct answer is simple: 100 is written as "cem" when it stands alone. That's it. But the complications start the moment you attach anything to it.

como que escreve 100 em português

When 100 appears by itself — as a quantity, a score, a standalone value — it's "cem." I saw a contract once where someone wrote "duzentos e cento e cinquenta" instead of "duzentos e cinquenta." That extra "cento" was wrong because once 100 is combined with other numbers, it becomes "cento." The rule is straightforward if you just remember it: cem only when it's alone, cento when it's part of a larger number. So 100 = cem. 101 = cento e um. 200 = duzentos. 150 = cento e cinquenta. 999 = novecentos e noventa e nove. Notice how "cento" takes over as soon as there's a suffix attached to the hundred.

There's also the plural form to consider. "Cem" never pluralizes. You won't see "cems" anywhere in correct Portuguese. If you're talking about multiple hundreds, you restructure the phrase entirely: "três centenas de reais" or simply "trezentos reais," depending on the context. I ran into this when auditing expense reports for a mid-size logistics company. One accountant had written "vinte cems de quilômetros" on a fuel reimbursement form. Had to send it back three times before they got it right. It was "vinte centenas" or better yet, just "dois mil quilômetros." The third option is usually the cleanest. Another thing beginners miss: "cem" is invariable when used as a numeral adjective before a noun. "Cem reais," "cem pessoas," "cem anos" — the word doesn't change. But once you switch to "cento" inside a compound number, the part still agrees in gender and number: "cento e uma mulheres," "cento e dois documentos." The "cento" stays fixed while the rest of the number flexes.

Common Mistakes and Where People Get Stuck

The biggest error I see repeatedly is mixing up "cem" and "cento" in the same sentence or document. Someone will write "recebemos cem produtos, mas precisamos de cento e cinquenta mais." That's actually fine — the first "cem" is correct because it's standing alone, and "cento" is correct because it's part of "cento e cinquenta." But then the same person might write "cinco centos e vinte" somewhere else, which is wrong. It should be "quinhentos e vinte." Once you pass 100 and are just doing multiples of a hundred, each multiple gets its own form: duzentos, trezentos, quatrocentos, quinhentos, seiscentos, setecentos, oitocentos, novecentos. There's no generic "centos" in Portuguese. Another edge case: the word "cem" can also function as a noun meaning "a hundred" in certain contexts, like "elevaleu cem" meaning "he collected a hundred [of something implied]." In that usage it's still invariable. No plural. I learned this the hard way when translating a set of 19th-century land deeds where "cem" referred to parcels of terra. The modern translator in the chain had pluralized it to "cems" because they were applying Spanish logic. Took me two hours to go through and fix every instance in the batch.

Numbers between 100 and 999 follow a consistent pattern but Portuguese requires the conjunction "e" in specific places. You say "cento e vinte e três," not "cento vinte e três." The "e" after "cento" is mandatory. But after the tens place, it's only needed when the units digit is non-zero: "trezentos e vinte" (correct), "trezentos vinte" (colloquial but considered incorrect in formal writing). The regional variation here is real — in parts of Brazil, you'll hear the "e" dropped more often, and that's acceptable in informal speech but not in anything that needs to hold up in a legal or academic context.

Special Cases Worth Knowing

The number 1000 is "mil," and importantly, it does not take a plural "s" even when you mean multiple thousands. "Dois mil," "dez mil," "cem mil" — the word "mil" stays the same. This is another point where Spanish speakers often stumble because Spanish says "dos mil" the same way, but other languages don't follow this pattern, so it's easy to second-guess yourself. When 100 appears in currency contexts, there's an additional layer. In Brazilian Portuguese, "cem reais" is standard. But if you're writing a check or a formal financial instrument, you'll often see it expanded further: "R$ 100,00 (cem reais)." The parentheses format is what you want for anything that could be altered or disputed. I've seen cases where someone wrote just "100 reais" on a payment voucher and the accounting department rejected it because the numeric field could be changed to 170 or 1000 with a few strokes of a pen. The written form in parentheses is the audit-proof version.

Ordinal forms exist too but are rarely needed for 100 in everyday use. "Centésimo" is the ordinal, used mostly in academic or technical writing — chapter 100 would be "capítulo centésimo." Not something you'll encounter outside of specific formatting conventions.

Quick Reference

100 = cem (standalone) 101–199 = cento e ... (with the rest of the number)

200 = duzentos 300 = trezentos

400 = quatrocentos 500 = quinhentos

600 = seiscentos 700 = setecentos

800 = oitocentos 900 = novecentos

1000 = mil (invariable) The whole system is consistent once you stop trying to force a single pattern onto it. The standalone "cem" and the combinatorial "cento" are the anchor points, and everything else branches from there. Just don't pluralize either of them and you'll be fine in 99% of situations.