Numbers and Time in Czech

Overview

Czech numbers interact with the case system in a way that English speakers find surprising. The number determines which case the following noun takes: 1 requires nominative singular, 2-4 require nominative plural, and 5+ require genitive plural. This three-tier system affects every counting situation, from shopping to telling time.

At the A1 level, learning cardinal numbers 0-100, basic ordinal numbers, and how to tell time gives you the tools for daily transactions, scheduling, and basic math. The number-case agreement pattern is one of Czech's most distinctive features and appears constantly in conversation.

Telling time in Czech uses a combination of cardinal numbers and specific constructions that differ from the English clock system, particularly for half hours.

How It Works

Cardinal Numbers 1-20

Number	Czech	Number	Czech
1	jeden/jedna/jedno	11	jedenact
2	dva/dve	12	dvanact
3	tri	13	trinact
4	ctyri	14	ctrnact
5	pet	15	patnact
6	sest	16	sestnact
7	sedm	17	sedmnact
8	osm	18	osmnact
9	devet	19	devatenact
10	deset	20	dvacet

Number-Noun Agreement

Number	Noun case	Example
1	Nominative singular	jeden dum (one house)
2-4	Nominative plural	dva domy (two houses)
5+	Genitive plural	pet domu (five houses)

Telling Time

Czech	English
Kolik je hodin?	What time is it?
Je jedna hodina.	It is one o'clock.
Jsou dve hodiny.	It is two o'clock.
Jsou tri hodiny.	It is three o'clock.
Je pet hodin.	It is five o'clock.
Je pul seste.	It is half past five.

Examples in Context

Czech	English	Note
Jsou tri hodiny.	It's three o'clock.	2-4: nom. plural
dva domy	two houses	2-4: nom. plural
pet domu	five houses	5+: gen. plural
dvacet jedna korun	twenty-one crowns	Complex number agreement
Mam deset minut.	I have ten minutes.	5+: gen. plural
jeden student	one student	1: nom. singular
ctyri lidi	four people	2-4: nom. plural
sto korun	one hundred crowns	5+: gen. plural
Je pul sedme.	It's half past six.	Half-hour construction
ve tri hodiny	at three o'clock	With preposition

Common Mistakes

Using the Same Noun Form for All Numbers

• Wrong: pet domy (using nominative plural after 5)
• Right: pet domu (genitive plural)
• Why: Numbers 5 and above require the genitive plural. This is a rigid rule with no exceptions.

Forgetting Gender Agreement for 1 and 2

• Wrong: jedna dum or dva zeny
• Right: jeden dum (m), dve zeny (f)
• Why: Jeden has three gender forms (jeden/jedna/jedno), and dva has two (dva for masculine, dve for feminine and neuter).

Translating Half Hours Literally

• Wrong: pul tri (trying to say half past three)
• Right: pul ctvrte (half of the fourth hour)
• Why: Czech counts half hours toward the next hour: pul ctvrte = halfway to four = 3:30.

Usage Notes

In formal and written Czech, numbers above four often appear with the verb in the singular neuter: Pet studentu prislo (Five students came -- literally "five of-students came-neuter"). In casual speech, the plural verb is also common. For prices, Czech uses the genitive plural with korun (crowns): To stoji sto korun (It costs 100 crowns).

Practice Tips

1. Counting exercises: Count objects around you in Czech, paying attention to the case change at 5: jedna kniha, dve knihy, tri knihy, ctyri knihy, pet knih.
2. Time telling practice: Look at a clock at random times and say the time in Czech. Focus especially on half hours.
3. Shopping scenarios: Practice prices and quantities: Chci tri rohliky a pet jablek.

Related Concepts

• Prerequisite: Case System Introduction -- numbers trigger different cases
• Next steps: Ordinal Numbers and Dates -- ordinals and date expressions
• Next steps: Numeral Categories -- collective, multiplicative, and other number types