Numbers and Counting in Swahili

In Brief

Swahili places a number after the noun: watu watatu means “three people.” The numbers 1–5 and 8 take an agreement prefix that matches the noun class, while 6, 7, 9, 10, and the tens do not change: compare vitabu vitano (“five books”) with vitabu sita (“six books”).

Overview

Numbers are among the first essentials at A1: you need them for prices, ages, dates, addresses, quantities, and everyday counting. The basic words are easy to recognize, and larger numbers follow a regular pattern with na, meaning “and.” For example, kumi na tano is literally “ten and five,” or fifteen.

The feature that often surprises an English-speaking learner is noun-class agreement. A noun class is a grammatical group of nouns that controls the form of nearby words. English says “one,” “two,” and “three” without changing the number to match “person,” “book,” or “tree.” In Swahili, some numbers receive a prefix that points back to the noun class: watu watatu, vitabu vitatu, but nyumba tatu.

The beginner rule is manageable: learn the basic number stems, remember that 1–5 and 8 agree, and copy the agreement pattern already used by the noun. The later sections show a broader range of classes and larger numbers; you do not need to memorize every class at once.

How It Works

The basic numbers

Swahili	English	Agreement behavior
moja	one	agrees with the noun class
mbili	two	agrees
tatu	three	agrees
nne	four	agrees
tano	five	agrees
sita	six	does not change
saba	seven	does not change
nane	eight	agrees
tisa	nine	does not change
kumi	ten	does not change

The forms in this list are useful when reciting numbers. Inside a noun phrase (a group built around a noun), the form may need a class prefix. The visible beginning can therefore change: -tatu appears as watatu, mitatu, matatu, or vitatu.

Put the noun first

The normal pattern is:

noun + number

• watu watatu — three people
• vitabu vitano — five books
• nyumba mbili — two houses

This is the reverse of the usual English order. Keep the noun first even when the quantity is written with digits in ordinary speech: 3 books is read as vitabu vitatu, not as an English-style number followed by a noun.

Agreement with common noun classes

The following table gives practical models for the numbers that change. The hyphen in forms such as -moja marks a stem: it is not normally written as a separate word in a sentence.

Noun class and model	1	2	3	4	5	8
Class 1/2, mtu/watu (person/people)	mmoja	wawili	watatu	wanne	watano	wanane
Class 3/4, mti/miti (tree/trees)	mmoja	miwili	mitatu	minne	mitano	minane
Class 5/6, tunda/matunda (fruit/fruits)	moja	mawili	matatu	manne	matano	manane
Class 7/8, kitabu/vitabu (book/books)	kimoja	viwili	vitatu	vinne	vitano	vinane
Class 9/10, nyumba (house/houses)	moja	mbili	tatu	nne	tano	nane

Some surface forms merge a prefix with the stem. For example, class 1 singular m- + moja produces mmoja, while class 7 ki- + moja produces kimoja. It is more useful to learn complete phrases than to pronounce the pieces separately.

Singular nouns naturally occur most often with one: mtu mmoja, mti mmoja, tunda moja, kitabu kimoja, nyumba moja. The plural columns are especially useful for two and above.

Numbers that do not agree simply follow any of these nouns unchanged:

Swahili	English	Note
watu sita	six people	sita stays unchanged
miti saba	seven trees	saba stays unchanged
vitabu tisa	nine books	tisa stays unchanged
nyumba kumi	ten houses	kumi stays unchanged

From eleven to ninety-nine

Use na between tens and units. There is no English-style “-teen” ending.

• 11: kumi na moja
• 15: kumi na tano
• 18: kumi na nane
• 21: ishirini na moja
• 47: arobaini na saba
• 99: tisini na tisa

Number	Swahili
10	kumi
20	ishirini
30	thelathini
40	arobaini
50	hamsini
60	sitini
70	sabini
80	themanini
90	tisini

When a compound number ends in 1–5 or 8, that final unit agrees with the noun: vitabu ishirini na vitatu (“twenty-three books”) and watu kumi na wawili (“twelve people”). The tens word itself remains unchanged.

Hundreds and thousands

Use mia for hundreds and elfu for thousands. A multiplier follows each word. Unlike English, standard Swahili normally includes na before the final tens or units.

Swahili	English	Structure
mia moja	one hundred	hundred + one
mia mbili	two hundred	hundred + two
mia tatu na tano	three hundred and five	hundreds + na + units
mia nne na ishirini	four hundred and twenty	hundreds + na + tens
elfu moja	one thousand	thousand + one
elfu mbili na mia tatu	two thousand three hundred	thousands + na + hundreds

In mia moja and elfu mbili, the counting forms after mia and elfu are conventional and do not copy the class of the item being counted. Agreement with an outer noun becomes most visible in the final agreeing unit: vitabu mia moja na vitano (“one hundred and five books”).

Examples in Context

Swahili	English	Note
Mtu mmoja anasubiri nje.	One person is waiting outside.	Class 1 singular: mmoja
Watu watatu wanafanya kazi hapa.	Three people work here.	Class 2: watatu
Nina vitabu vitano.	I have five books.	Class 8: vitano
Tumenunua vikombe vinane.	We have bought eight cups.	Class 8: vinane
Kuna miti minne bustanini.	There are four trees in the garden.	Class 4: minne
Nataka matunda mawili.	I want two pieces of fruit.	Class 6: mawili
Nyumba mbili zinauzwa.	Two houses are for sale.	Class 10: mbili
Ana paka sita.	He or she has six cats.	sita never agrees
Tutakaa siku kumi na tano.	We will stay for fifteen days.	The concept’s fifteen-day pattern
Darasani kuna wanafunzi ishirini.	There are twenty students in the classroom.	Exact tens do not agree
Nimenunua kalamu ishirini na moja.	I have bought twenty-one pens.	Final moja matches class 10
Mkutano una watu mia moja na watano.	The meeting has one hundred and five people.	Final watano matches people

Common Mistakes

Putting the number before the noun

• Wrong: watatu watu
• Right: watu watatu
• Why: English puts “three” first, but the ordinary Swahili order is noun + number.

Using the bare counting form with every noun

• Wrong: vitabu tano
• Right: vitabu vitano
• Why: Five is one of the agreeing numbers. With a class 8 plural noun, it takes vi-.

Making six, seven, or nine agree

• Wrong: watu wasita
• Right: watu sita
• Why: sita, saba, and tisa are invariant: they do not take noun-class prefixes.

Forgetting agreement in the final part of a compound number

• Wrong: watu kumi na mbili
• Right: watu kumi na wawili
• Why: In “twelve people,” the final two still agrees with watu. The word kumi remains unchanged.

Dropping na inside a compound number

• Wrong: kumi tano
• Right: kumi na tano
• Why: Swahili joins tens and units with na: literally, “ten and five.”

Guessing agreement from the English meaning

• Wrong approach: treating every object as if it used the ki-/vi- pattern
• Right approach: learn the noun together with its singular and plural class, then choose the matching number form.
• Why: Meaning can give clues, but grammatical class—not the English translation—controls agreement.

Usage Notes

When numbers are recited on their own, in calculations, or as labels, you will hear the basic sequence moja, mbili, tatu.... When the number counts a stated noun, agreement becomes relevant. This distinction explains why a learner may correctly hear both tatu in a count and watatu in a phrase about people.

Digits do not remove agreement. A sign may show vitabu 3, but a speaker reads the quantity as vitabu vitatu. In prices and phone numbers, however, speakers may read the numeric components as independent numbers rather than as modifiers of a noun.

For people, everyday Swahili can omit the noun when the context is clear: Wamekuja wangapi? Watatu. means “How many have come? Three.” The form watatu still carries the class 2 agreement and therefore signals that people are meant.

Beyond the Basics / Advanced Use

You do not need to master these points at A1, but they explain forms you will meet later.

Asking “how many?”

The question stem -ngapi also agrees with the noun class, much like an agreeing number:

• watu wangapi? — how many people?
• vitabu vingapi? — how many books?
• nyumba ngapi? — how many houses?

The answer repeats the appropriate pattern: watu watatu, vitabu vitano, nyumba mbili.

Ordinal numbers are a different system

Cardinal numbers tell you quantity: one, two, three. Ordinal numbers tell you order: first, second, third. Common forms include kwanza (“first”) and pili (“second”). From “third” onward, Swahili often uses an agreeing connector equivalent to “of” before the number, as in siku ya tatu (“the third day”). Do not use siku tatu if you mean “the third day”; that phrase means “three days.”

Agreement can reveal an omitted noun

Because an agreeing prefix carries class information, the noun does not always need to be repeated. In a shop, after Unataka vitabu vingapi? (“How many books do you want?”), Vitano is a complete and natural answer: “Five.” This is why learning prefixes is useful beyond number drills.

Dates, years, decimals, and money

These contexts develop their own conventions. Dates may use ordinal-style expressions, while years are read as full cardinal numbers. Decimal notation and currency expressions also affect how number groups are read. First become comfortable with noun + number, agreement, and na; then learn these formats as set real-world patterns rather than forcing English reading habits onto them.

Practice Tips

1. Build six phrase families. Take one noun from each common class and say it with 1, 2, 3, 4, 5, 6, and 8. The contrast between an agreeing number and unchanged sita makes the rule memorable.
2. Read everyday quantities aloud. Turn “3 books,” “12 people,” and “25 trees” into vitabu vitatu, watu kumi na wawili, and miti ishirini na mitano. Always say the noun before the number.
3. Practice in layers. First master 1–10, then exact tens, then tens plus units, and finally hundreds. Check only two things each time: whether na is present and whether the final unit needs agreement.

Related Concepts

• Useful foundation: Noun Class 1/2: M-/Wa- (People) — explains the contrast in mtu mmoja and watu wawili.
• Useful foundation: Noun Class 3/4: M-/Mi- (Trees/Plants/Objects) — supports forms such as miti mitatu.
• Useful foundation: Noun Class 7/8: Ki-/Vi- (Things/Tools) — gives the pattern behind kitabu kimoja and vitabu vitano.
• Useful foundation: Noun Class 9/10: N- (Animals/Borrowed Words) — helps with number phrases such as nyumba mbili.
• Next step: Adjective Agreement with Noun Classes — extends the same agreement habit to descriptive words.