Mimi ninatumia kikokotoo kidogo kukagua majibu ya hesabu nyumbani.

Mimi is the independent pronoun I / me. In Swahili, the subject is already built into the verb, so ni- in ninatumia already tells you the subject is I.

That means Mimi is often optional here. It is usually added for:

• emphasis: I use...
• contrast: I use..., but someone else does something different
• clarity in conversation

So:

• Ninatumia kikokotoo kidogo... = perfectly normal
• Mimi ninatumia kikokotoo kidogo... = I use a small calculator...

Ninatumia can be broken down like this:

• ni- = I
• -na- = present tense / ongoing action
• tumia = use

So:

• ni-na-tumia → ninatumia = I use / I am using

This tense often covers both English simple present and present progressive, depending on context.

Swahili does not normally use articles like English a, an, or the.

So kikokotoo kidogo can mean:

• a small calculator
• the small calculator

The exact meaning depends on context.

This is very normal in Swahili. You usually do not need to add anything to show a/the.

Kikokotoo means calculator.

It belongs to the ki-/vi- noun class:

• singular: kikokotoo
• plural: vikokotoo

This matters because adjectives and some connectors must agree with the noun class. That is why the adjective is kidogo, not just dogo by itself.

The basic adjective stem is -dogo, meaning small / little.

In Swahili, adjectives agree with the noun class of the noun they describe. Since kikokotoo is in the ki-/vi- class, the adjective takes the matching prefix:

• ki + dogo → kidogo

So:

• kikokotoo kidogo = small calculator

Compare:

• kitabu kidogo = small book
• vikokotoo vidogo = small calculators

So kidogo is not a different adjective; it is the agreed form of -dogo.

In Swahili, adjectives usually come after the noun they describe.

So:

• kikokotoo kidogo = literally calculator small

This is the normal word order in Swahili.

More examples:

• mtoto mdogo = small child
• nyumba kubwa = big house
• kitabu kizuri = good book

Kukagua is the infinitive form of the verb to check / inspect / review.

It is made of:

• ku- = infinitive marker, like English to
• kagua = check, inspect

In this sentence, it shows purpose:

• ninatumia kikokotoo kidogo kukagua majibu...
• I use a small calculator to check the answers...

So kukagua answers the question for what purpose? → to check the answers

Because Swahili usually builds the infinitive directly into the verb with ku-.

So English uses a separate word:

• to check

But Swahili uses one word:

• kukagua

This is very common:

• kusoma = to read / to study
• kuandika = to write
• kuona = to see

Literally, majibu ya hesabu means something like:

• answers of arithmetic
• answers of calculations
• math answers

A breakdown:

• majibu = answers
• ya = of / belonging to / related to
• hesabu = arithmetic, mathematics, calculation(s)

So the phrase refers to the answers to math problems or calculation answers.

Ya is a possessive/associative connector, often translated as of.

It must agree with the noun that comes before it, not the noun after it.

Here the noun before it is majibu (answers), which belongs to the ma- class. The agreement form for that class is ya.

So:

• majibu ya hesabu = answers of arithmetic / math answers

Compare:

• kitabu cha mwanafunzi = student’s book
• vitabu vya mwanafunzi = student’s books
• majibu ya mwanafunzi = student’s answers

Because the connector agrees with majibu, not with hesabu.

• majibu is a ma- class noun
• the matching connector is ya

So:

• majibu ya hesabu

If the first noun were from a different noun class, the connector would change:

• kitabu cha hesabu = math book
• vitabu vya hesabu = math books

This agreement pattern is very important in Swahili.

In this sentence, hesabu is best understood as a general noun meaning:

• arithmetic
• math
• calculation

Many Swahili nouns do not work exactly like English countable nouns, so you do not always need to mark singular/plural the same way English does.

Here, hesabu is functioning more like a subject area or type of work:

• majibu ya hesabu = math answers / arithmetic answers

Nyumbani means at home or in/at the house/home.

The ending -ni is often a locative marker in Swahili. It can show location.

So:

• nyumba = house / home
• nyumbani = at home / in the house

This is why Swahili often does not need a separate preposition like English at in such expressions.

Other examples:

• shuleni = at school
• sokoni = at the market
• mezani = on the table / at the table

Because the locative meaning is already built into nyumbani.

English says:

• at home

Swahili says:

• nyumbani

The -ni ending often carries the idea of location, so no extra word is necessary here.

Yes. You can say:

• Mimi ninatumia kikokotoo kidogo kukagua majibu ya hesabu nyumbani.
• Ninatumia kikokotoo kidogo kukagua majibu ya hesabu nyumbani.

Both are correct.

The version with Mimi sounds more emphatic or contrastive. The version without it is often more natural in ordinary speech if no emphasis is needed.

The sentence follows a very common Swahili pattern:

• Mimi = subject pronoun
• ninatumia = verb
• kikokotoo kidogo = object + adjective
• kukagua majibu ya hesabu = purpose phrase
• nyumbani = place

So roughly:

• I use [a small calculator] [to check math answers] [at home].

This is a natural and straightforward Swahili sentence structure.

Yes. In English, you might naturally translate the purpose in slightly different ways:

• to check math answers
• for checking math answers
• in order to check math answers

In Swahili, kukagua after the main verb often expresses that same purpose clearly.

So the idea is:

• I use a small calculator in order to check the answers.

In this form, yes: ni-na-tumia is a present-time form.

It can mean:

• I use
• I am using

Which one sounds best in English depends on context.

If you changed the tense marker, the meaning would change:

• nilitumia = I used
• nitatumia = I will use

So the middle part of the verb is very important in Swahili.

Yes. Ninatumia can describe either:

• something happening now, or
• a regular habit

So this sentence could mean:

• I am using a small calculator at home to check math answers or
• I use a small calculator at home to check math answers

Context tells you which meaning is intended.