Numbers, Prices & Quantities — I can understand and use numbers, prices, and quantities accurately in common contexts.

Historical Context & Motivation

Numbers are among the oldest elements of any language, and Portuguese is no exception. The Portuguese numeral system descends directly from Latin, the language of the Roman Empire, which spread across the Iberian Peninsula over two thousand years ago. As Portugal emerged as an independent kingdom in the twelfth century, its counting system crystallized into the forms we still use today. Understanding how these numbers evolved helps explain some of the quirks you'll encounter — like why some numbers change form depending on gender, or why the word for "hundred" has both masculine and feminine versions.

Whether you're ordering food in Lisbon, haggling at a market in São Paulo, or simply reading a price tag, numbers and quantities form the backbone of everyday Portuguese communication. The central question this lesson addresses is: How do you accurately express, understand, and manipulate numbers, prices, and quantities in Portuguese conversations?

Core Principles & Definitions

Before diving into specific numbers, it helps to understand the foundational rules that govern how Portuguese handles counting, pricing, and measuring. These principles will save you from common mistakes and help you sound natural in conversation.

Visual Explanation — The Portuguese Number System

As you study the diagram above, notice a few important patterns. The numbers 11 through 15 have unique forms that don't follow a predictable pattern — you simply need to memorize them. However, 16 through 19 combine dez (ten) with the unit number, which is more intuitive. The tens (20, 30, 40, etc.) each have their own word, and compound numbers within each decade are formed by adding e plus the unit: trinta e cinco (35), oitenta e nove (89). This connector e is one of the most distinctive features of Portuguese numbers — English doesn't use "and" the same way.

How Prices & Currency Work in Portuguese

When you walk into a shop in Brazil or Portugal, knowing your numbers isn't enough — you also need to know how to talk about prices naturally. Portuguese has specific patterns for stating costs, asking about prices, and handling decimal values. Let's break down the key structures.

Asking & Stating Prices

Common Price Conversation Phrases

Quantity Expressions & Measurement

Beyond basic numbers and prices, you'll frequently need to express quantities — how much of something you want, how many items you need, or how to describe amounts in general terms. Portuguese quantity expressions fall into two main categories: definite quantities (specific numbers and measurements) and indefinite quantities (general amounts like "a lot" or "a few").

One of the trickiest aspects of indefinite quantities is their gender and number agreement. The word muito can appear as muito (m. sg.), muita (f. sg.), muitos (m. pl.), or muitas (f. pl.), depending on what follows it. For example, muito dinheiro (a lot of money, masculine) versus muita água (a lot of water, feminine). The exception is bastante, which only changes for number (singular vs. plural), not gender.

Definite Quantity Patterns at the Market

Worked Example — A Trip to the Market

Let's walk through a realistic scenario: you're at an open-air market in Rio de Janeiro, and you need to buy ingredients for a recipe. This exercise brings together numbers, prices, quantities, and the key phrases you've learned.

Brazilian vs. European Portuguese — Key Differences

Portuguese is spoken across multiple continents, and there are notable differences between Brazilian Portuguese (PT-BR) and European Portuguese (PT-PT) when it comes to numbers, prices, and quantities. Being aware of these variations will help you communicate clearly in either context and avoid confusion when listening to native speakers.

Connection to Advanced Usage — Ordinals, Fractions & Large Numbers

Once you've mastered cardinal numbers and basic quantity expressions, the next step is to explore ordinal numbers (first, second, third), fractions, and large numbers in the thousands and millions. These come up in contexts like addresses, dates, statistics, and academic discussions.

Here's a preview of ordinal numbers, which are especially common in everyday life. You'll use them for floors of buildings (segundo andar — second floor), dates (primeiro de janeiro — January 1st), and rankings. Like the hundreds, ordinals agree in both gender and number: primeiro (m.), primeira (f.), primeiros (m. pl.), primeiras (f. pl.). Mastering the cardinal numbers in this lesson gives you the strong foundation needed to tackle these more advanced forms.

Practice Problems

Lesson Summary