The 100 Most Common Spelling Mistakes that Kids Make: Latin Prefixes in English Spelling

Apr 01, 2026

English spelling can seem irregular at first, but much of it becomes clearer when we understand where words come from. A large number of English words are built from Latin roots and prefixes, and these prefixes often shape both meaning and spelling in consistent ways.

Latin Prefixes in English Spelling

A prefix is added to the beginning of a word to change its meaning. You can refer to our post on How Words Are Built. In this post we introduced the notion of word morphology with the different prefixes and suffixes and how they impact the meaning of the word.

Many common prefixes come directly from Latin, such as:

un- (not)
re- (again)
pre- (before)
sub- (under)
trans- (across)
in- (not)

These prefixes appear in hundreds of English words and form recognizable patterns.

How Latin Prefixes Affect Spelling

Latin prefixes do not always stay the same. They often change form to match the first letter of the base word, making pronunciation smoother.

This is one of the most important patterns to teach.

The Prefix in- (meaning “not”)

in + possible → impossible
in + legal → illegal
in + regular → irregular

The prefix changes:

in → im before p, b, m
in → il before l
in → ir before r

This is not random. It is a consistent spelling pattern based on sound.

To make this easier to remember, I’ve created a simple Downloadable Printable Guide you can use with your child.

Word Families Build Understanding

Teaching prefixes through word families helps children see structure clearly.

**Example: sub- (meaning “under”)**

submarine
submerge
subsoil
subtitle

The spelling of sub- remains stable, reinforcing both meaning and recognition.

**Example: trans- (meaning “across”)**

transport
transfer
transform
transmit

Children begin to recognize that trans- carries the idea of movement or change across something.

Why Children Make Mistakes

A child might write:
❌ inpossible
❌ unregular

These are not careless mistakes. They show that the child is:
✔ hearing the word correctly
✔ attempting to apply a prefix

What is missing is the knowledge that prefixes follow patterns of change.

Spelling Is More Than Sound

Phonics is essential, but it is only part of spelling. Latin prefixes show that spelling also depends on:

meaning
word structure
history

When children understand this, spelling becomes more logical and less frustrating.

Simple Ways to Help Children Remember

Here are practical, gentle strategies:

1. Start with a root word

Begin with one familiar word and build from it.
For example:

regular → irregular → regulate → regularity

This helps the child stay anchored in meaning while seeing how words grow.

2. Explore prefixes through that root

Instead of teaching many prefixes at once, apply different prefixes to the same root word. Ask: What happens when we add a prefix? Does the meaning change?

This keeps learning focused and meaningful.

3. Notice correct forms and exceptions

Children may try forms like unregular, which shows understanding in progress.

By studying the correct word irregular, they begin to see that prefixes follow patterns of usage, not just simple rules.

4. Encourage careful observation

Ask: What do these words have in common? What part stays the same?
This helps children recognize the root within each word.

5. Use copywork in context

Let children copy well-written sentences containing these word families.
Through careful attention, the eye begins to remember the correct forms naturally.

Why Learning Latin Is Beneficial

Studying Latin, even at a simple level, can greatly support spelling.

Children begin to:

recognise familiar word parts
understand meanings more deeply
spell longer words with confidence

Latin provides a foundation that makes English vocabulary more predictable and connected.

Here are some useful links to introduce Latin to kids:

A Language That Makes Sense

English spelling is not random, it reflects a long history shaped by Latin and other languages. When children understand prefixes, they gain a powerful tool. Words are no longer isolated or confusing, but part of a larger, meaningful system.

With time and practice, spelling becomes not a matter of guessing, but of understanding