Numbers, Dates & Measurements — I can use numbers, dates, time, and measurement expressions (prices, distances, duration) accurately in common contexts.

Historical Context & Motivation

Every language develops its own system for expressing quantities, dates, and measurements, and Spanish is no exception. The Spanish number system, calendar conventions, and measurement vocabulary evolved from a rich mix of Latin roots, Arabic mathematical influence during the centuries of Moorish presence on the Iberian Peninsula, and later standardization efforts. Understanding how these systems came to be helps you see why certain patterns exist—like why the days of the week reference planets, or why telling time in Spanish uses a different structure than English.

So why does this matter for you as a Spanish 2 student? Because numbers, dates, and measurements appear in virtually every real-world conversation—from buying a coffee (Cuesta tres euros cincuenta) to making plans (Nos vemos el viernes a las dos). The core question this lesson addresses is: How do I accurately express quantities, dates, times, prices, distances, and durations in Spanish?

Core Principles & Definitions

Before diving into specific categories, let's establish the foundational rules that govern how numbers and related expressions work in Spanish. These principles apply across all contexts—whether you're talking about prices at a market, distances on a road trip, or the date of an event.

Visual Explanation — The Spanish Number Map

As the diagram shows, the Spanish number system has distinct zones. The first zone (0–15) requires pure memorization, since each word is unique. The second zone (16–29) introduces a helpful pattern: the numbers are compounds of dieci- and veinti- fused with single-digit numbers. Starting at 30, the pattern stabilizes into the reliable [tens] y [ones] formula that carries you all the way through 99. From 100 onward, you simply combine hundreds, tens, and ones—but remember that the hundreds from 200 to 900 must agree in gender with the noun they describe.

How It Works — Dates, Time & Currency Patterns

Expressing Dates

Spanish dates follow the structure el + [cardinal number] + de + [month] + de + [year]. Unlike English, which uses ordinal numbers for dates ("January 5th"), Spanish uses cardinal numbers for every day except the first, which uses the ordinal primero. The months are never capitalized in Spanish, and the date order is always day-month-year.

Telling Time

Time in Spanish revolves around the verb ser. The hour 1:00 is singular (Es la una), while all other hours are plural (Son las dos, Son las tres). To add minutes past the hour, use y; to express minutes before the next hour, use menos. Special vocabulary includes y media (half past) and y cuarto (quarter past).

Prices & Currency

When discussing prices, Spanish uses the verb costar (to cost), which is a stem-changing verb (o → ue): cuesta for singular items and cuestan for plural. Prices use the comma for decimals: Cuesta 15,99 euros. In many Latin American countries, the currency is el peso, while in Spain it is el euro. Asking "How much does it cost?" is ¿Cuánto cuesta? / ¿Cuánto cuestan?.

Detailed Breakdown — Measurement Expressions

Measurement expressions in Spanish cover distance, weight, volume, temperature, and duration. Because the metric system is standard throughout the Spanish-speaking world, you'll use metros, kilómetros, kilogramos, litros, and grados Celsius far more often than their imperial counterparts. Duration expressions use specific vocabulary and prepositions that differ from English patterns.

Worked Example — Planning a Trip to Spain

Let's put everything together by working through a realistic scenario. Imagine you're planning a trip to Spain and you need to communicate details about the date, flight duration, distance, hotel price, and meeting time—all in Spanish.

Common Pitfalls & Comparisons

Learning to express numbers, dates, and measurements in Spanish involves navigating several traps that English speakers commonly fall into. The table below compares frequent mistakes with the correct Spanish forms and explains the underlying rule.

Connecting to Advanced Expressions

The number and measurement skills you're building now serve as a foundation for more sophisticated Spanish communication. As you advance, you'll encounter contexts where these basics expand into new territory—percentages in news articles, approximate quantities in conversation, and formal written number conventions in business or academic settings.

One particularly useful advanced structure is the 24-hour clock, which is widely used in Spain and parts of Latin America for schedules and formal contexts. Instead of saying las tres de la tarde, you'd say las quince horas. This eliminates all AM/PM ambiguity—a concept that will feel very natural once you've mastered the 12-hour clock from this lesson. Similarly, learning to express approximate quantities with expressions like unos/unas (about), más o menos (more or less), and aproximadamente (approximately) will make your Spanish sound much more natural.

Practice Problems

Lesson Summary