Tulisan di papan tulis itu mudah dimengerti.

Tulisan is a noun. It usually means writing, written text, or sometimes handwriting depending on context.

In this sentence, tulisan refers to the written words/text on the board.

Compare:

• tulisan = writing, written text
• menulis = to write
• tertulis = written, in written form

So:

• Saya menulis di papan tulis. = I write on the board.
• Tulisan di papan tulis itu... = The writing on the board...

This is a very important Indonesian spelling point.

• di written separately is a preposition meaning in, on, or at
• di- written attached is a passive verb prefix

So:

• di papan tulis = on the board
  
  • here di is a preposition, so it is separate
• dimengerti = understood / can be understood
  
  • here di- is a verb prefix, so it is attached

A good rule:

• if di shows location, write it separately
• if di- makes a passive verb, attach it

Papan tulis literally means writing board.

It is the normal Indonesian term for a blackboard or whiteboard, depending on context. Indonesian often uses the same phrase for both unless the speaker wants to be more specific.

So di papan tulis means on the board.

In Indonesian, demonstratives like ini and itu usually come after the noun phrase they describe.

So instead of English-style:

• that writing

Indonesian says:

• tulisan itu

And with a longer noun phrase:

• tulisan di papan tulis itu

This can mean:

• that writing on the board, or
• the writing on that board

In real usage, context usually makes the meaning clear.

Structurally, itu comes after the whole phrase tulisan di papan tulis, so it can feel like it points to the entire noun phrase.

In practice, this sentence is most naturally understood as:

• that writing on the board

But depending on context, it could also be interpreted as:

• the writing on that board

This kind of slight ambiguity is normal in Indonesian. Usually the situation makes it obvious.

If someone wanted to be extra clear, they might rephrase it.

Mudah means easy.
Dimengerti is a passive form meaning understood or able to be understood.

So mudah dimengerti literally means:

• easy to be understood

In natural English, that becomes:

• easy to understand

This is a very common Indonesian pattern:

• mudah dimakan = easy to eat
• sulit dipercaya = hard to believe
• mudah dipelajari = easy to learn

So adjective + passive verb is a normal and useful structure.

Because the sentence is describing the writing, not the person who understands it.

• mengerti = to understand
• dimengerti = understood / can be understood

If you said mudah mengerti, it would sound like easy to understand (something), and the subject would be the one doing the understanding. That does not fit here.

The writing is the thing being understood, so Indonesian uses the passive-style form:

• mudah dimengerti = easy to understand

Yes, you can.

• mudah dimengerti
• mudah untuk dimengerti

Both are correct.

The version without untuk is very common and more direct.
The version with untuk can sound a little more explicit or slightly more formal in some contexts.

In everyday Indonesian, mudah dimengerti is completely natural.

They are similar, but not always exactly identical.

• mengerti / dimengerti often means to understand / understandable
• memahami / dipahami often suggests to comprehend, grasp, understand more deeply

In many simple sentences, they can overlap:

• mudah dimengerti
• mudah dipahami

Both can mean easy to understand.

But dipahami can sometimes sound a little more formal or a little deeper in meaning.

Indonesian often does not need a copula like is / am / are in simple statements.

So:

• Tulisan di papan tulis itu mudah dimengerti.

literally looks like:

• Writing on board that easy understood.

But in proper English, of course, we say:

• The writing on the board is easy to understand.

This is normal Indonesian grammar. In many sentences, the subject is followed directly by an adjective or noun without any equivalent of is.

The sentence can be broken down like this:

• Tulisan di papan tulis itu = the writing on the board / that writing on the board
• mudah dimengerti = easy to understand

So the pattern is:

• Subject noun phrase + adjective phrase

More specifically:

• tulisan = head noun
• di papan tulis = prepositional phrase modifying tulisan
• itu = demonstrative
• mudah dimengerti = predicate

This is a very common Indonesian sentence pattern.

Yes, tulisan can sometimes mean handwriting, but context matters.

It can refer to:

• written text
• a piece of writing
• handwriting style

In this sentence, if someone is talking about whether the words on the board are clear and understandable, tulisan most likely means the writing/text on the board.

If the focus were specifically on penmanship or legibility, English might translate it as handwriting, but the Indonesian word itself does not force that meaning.

This sentence is already neutral and natural.

A few possible variations:

• Tulisan di papan tulis itu gampang dimengerti.
  More casual, because gampang is less formal than mudah

• Tulisan di papan tulis itu mudah dipahami.
  Slightly more formal or academic-sounding

• Tulisan di papan tulis itu jelas dan mudah dimengerti.
  Adds clear and easy to understand

But the original sentence is perfectly standard Indonesian.