How to write numbers in Portuguese inside real sentences

Introduction

Learning how to write numbers in Brazilian Portuguese inside real sentences helps you communicate clearly in messages, emails, forms, and everyday notes. This article explains when to use numerals or words, punctuation differences, common patterns, and practical examples for beginners and intermediate learners.

Why number writing matters in Portuguese

Numbers appear in addresses, dates, prices, phone numbers, quantities, ages, schedules, and more. Choosing numerals or words affects clarity, tone, and formality. In Brazilian Portuguese, some contexts favor digits for clarity while others prefer spelled-out words for style or readability.

Basic rules: digits versus words

Use digits for practical, precise information: phone numbers, prices, times, measurements, percentages, ages, and dates in numeric form. Use words for rounded numbers, literary style, formal documents, or when beginning a sentence. Many beginners mix both; here are clear patterns to follow.

Common preference: numbers from zero to ten are often written as words in informal writing, but digits are also acceptable in casual messages. Numbers above ten are usually digits in practical contexts.

When a sentence starts with a number, spell it out or rephrase the sentence to avoid awkward long words at the start.

Punctuation differences: decimal and thousand separators

Brazilian Portuguese uses a comma for decimals and a period for thousands. For example, write 1.000 for one thousand and 3,5 for three point five. In many digital contexts, Portuguese writers accept the international system, but follow the comma/period rule for natural Brazilian texts.

Examples showing separators:

Preco do produto: R$ 1.299,90

Distância aproximada: 2.500 km

Nota média: 8,5

Dates and times in sentences

Dates are often written numerically in forms but spelled or mixed in personal writing. In Brazilian Portuguese, the order is day-month-year. Use digits for forms: 12/06/2026 or 12 de junho de 2026 in words for messages and emails.

Times use a colon or the word horas. In informal chat, 8:30 and 8h30 are common; in writing, 8h30 and 08:30 both work.

Examples:

Reunião dia 12 de junho de 2026 às 14h30.

Meu voo é em 07/07/2026 às 06:00.

Money, prices, and currency format

Always use R$ before amounts in Brazilian reais. Use a period for thousands and a comma for cents. For readability in sentences, combine words and digits when necessary.

Examples:

Custa R$ 45,90 no mercado.

Total da compra: R$ 1.250,00.

Quero pagar R$ 20 em dinheiro.

Percentages, fractions, and measurements

Percent is written with the symbol % and usually placed after the number without a space in Portuguese: 50%. Fractions in simple texts can be written as 1/2 or meia, depending on formality.

Measurements use digits plus abbreviation: 10 kg, 2 m, 3 cm. When writing units in full, use lowercase: 10 quilogramas, 2 metros.

Examples:

Desconto de 15% na loja.

Ele correu 5 km hoje.

Receita: 1/2 xícara de açúcar.

Phone numbers and addresses

Phone numbers are written in groups for readability: (11) 91234-5678. Addresses use digits for house numbers and apartment numbers: Rua das Flores, 123, apto 45.

Examples:

Me ligue: (21) 99876-5432.

Endereço: Rua das Laranjeiras, 250, Bloco B, apto 302.

Ordinal numbers and dates in words

Ordinals are used for floors, centuries, and formal lists. In Portuguese, ordinals agree in gender and number with the noun. Use numerals with the abbreviation when space is limited: 1º, 2ª, 3º.

When writing fully: primeiro, segunda, terceiro. For dates in words you can say Primeiro de maio or 1º de maio. Use masculine or feminine forms to match the noun: 1º andar, 2ª vez.

Examples:

Moramos no 8º andar.

Esta é a 2ª vez que eu tento.

Writing numbers in sentences: patterns and templates

Use these patterns to write natural sentences with numbers in everyday contexts. Replace the bracketed content with your info.

Buying and prices: Comprei [quantidade] [item] por R$ [valor].
Example: Comprei 3 livros por R$ 89,90.

Scheduling: Vamos nos encontrar [data] às [hora].
Example: Vamos nos encontrar 15/06/2026 às 19h00.

Asking age: Quantos anos você tem? / Eu tenho [número] anos.
Example: Eu tenho 27 anos.

Giving measurements: A corrida foi de [distância] km.
Example: A corrida foi de 10 km.

Phone or contact: Meu número é ([DDD]) [número].
Example: Meu número é (11) 91234-5678.

Practical beginner examples you might write

Simple messages, forms, and emails often mix digits and words. Use these realistic examples to copy and modify.

Chat message: O jantar é hoje às 20h?

Shopping list: Leite 2L, pão 1 pacote, ovos 12.

Email to professor: Prezada professora, minha entrega será dia 09/06/2026. Peço desculpas pelo atraso.

Travel note: Ida 07/07/2026, volta 14/07/2026. Hotel: Rua Central, 45.

Class exercise: Escreva seu número de telefone e a idade: Nome: Ana, Idade: 22, Telefone: (31) 98765-4321.

Formality and tone: when to spell out numbers

In formal letters or academic writing, spell out rounded numbers and small numbers in words. Use numerals for precise technical data. In casual texts, digits are faster and acceptable.

Formal example: Envio esta carta em 15 de junho de 2026 para confirmar minha presença.
Informal example: Encontro às 18h, combinado?

Common mistakes and how to avoid them

Using the wrong decimal separator: remember to use comma for decimals in Brazilian Portuguese. Write 2,5 not 2.5 when writing natural Portuguese sentences.

Starting sentences with long numerals: avoid beginning a sentence with a large number; rewrite the sentence to start with words or rephrase.

Mixing ordinals without agreement: match ordinals to the noun gender and number, e.g., 3ª semana, 1º lugar.

Incorrect currency punctuation: include R$ and use proper separators: R$ 3.000,00 not R$3,000.00 in a Brazilian context.

Quick tips for writing numbers naturally

For clarity, use digits for phone numbers, prices, dates in forms, times, and measurements.

Spell out small numbers in formal sentences or when they begin a sentence; otherwise digits are fine.

Remember comma for decimals and period for thousands in Brazilian Portuguese style.

Use ordinal abbreviations with the correct superscript in formal documents if available: 1º, 2ª, 3º; otherwise write primeiro, segunda, terceiro.

Practice exercise (fill-in examples)

Complete these sentences with appropriate numbers. Try both digits and spelled-out options.

1) Meu aniversário é em __ de ___.
Example answer: 5 de maio or cinco de maio.

2) Preciso de __ litros de água para a receita.
Example answer: 2 litros.

3) Vamos nos encontrar às __h na estação.
Example answer: 17h.

Conclusion

Writing numbers in Brazilian Portuguese inside real sentences becomes natural when you learn when to use digits versus words, apply comma and period rules for decimals and thousands, and match ordinals for gender. Use the templates and examples here to write practical messages, emails, forms, and notes with confidence.