Years 3 and 4 English · Key Stage 2 · Reading – word reading

Years 3 and 4 root words, prefixes and suffixes in reading

By Year 3 most children can read the words in their books without sounding out every letter. The challenge now is the longer, less familiar words that crop up in stories and non-fiction. Children are taught to spot the parts a word is built from (root, prefix and suffix) so they can read it aloud and work out what it means, and to notice the odd letters in tricky words such as island and answer.

Reading new words from their parts, explained

Many long words are not as scary as they look, because they are built from smaller pieces. A root word carries the main meaning (agree), a prefix is a group of letters added to the front (dis-) and a suffix is added to the end (-ment). Put together, disagreement can be read in chunks and understood from its parts: not agreeing, plus the ending that turns the idea into a thing. The National Curriculum calls this morphology, the study of how words are made of meaningful pieces, and etymology, where words come from.

The parts children are expected to know in Years 3 and 4 are set out in the National Curriculum’s spelling appendix (English Appendix 1). Building on un- from Year 1, prefixes include dis-, mis-, re-, in- and its variants il-, im- and ir- (as in illegal, impossible and irregular), as well as sub-, inter-, super-, anti- and auto-. Suffixes include -ly, -ous, -ation, -tion, -sion, -ssion, -cian and endings such as -sure and -ture, as in treasure and creature. Spotting these parts means a long word like superhero or interact becomes two readable chunks.

Understanding comes first, though. The National Curriculum is clear that, at this stage, teaching comprehension should take precedence over teaching the reading of individual words. So this topic usually shows up inside reading lessons: for example, a teacher stops at a long word, circles the chunks and asks what the prefix might tell the class. When children read a long word aloud they are encouraged to try different pronunciations and pick the one that matches a word they have heard. Technical, for instance, sounds odd with ch as in chip, but fits perfectly when ch says k.

Children also meet further exception words: words where the spelling and sound don’t match in the usual way, so the unusual part has to be noticed. Island has a silent s, answer has a silent w, guard has a u that isn’t sounded, and heart and weight use unusual letter patterns for their sounds. All five are on the statutory Years 3 and 4 word list, which schools work through over the two years. Whichever word it is, the idea is the same: look for the part that surprises you and remember where in the word it sits.

Words your child will hear

Root word: The main part of a word that carries its meaning, such as agree in disagreement.
Prefix: Letters added to the start of a word that change its meaning, like dis- in disagree.
Suffix: Letters added to the end of a word, like -ment in agreement or -ly in slowly.
Morphology: How words are built from smaller meaningful parts.
Etymology: Where a word comes from and how it has changed over time.
Exception word: A word with an unusual spelling-to-sound link, such as island.
Chunk: A group of letters read as one piece, such as dis, agree and ment.

What the National Curriculum says

In Years 3 and 4, pupils should be taught to:

Apply their growing knowledge of root words, prefixes and suffixes (etymology and morphology) as listed in English appendix 1, both to read aloud and to understand the meaning of new words they meet
Read further exception words, noting the unusual correspondences between spelling and sound, and where these occur in the word

Objectives from the National Curriculum in England, © Crown copyright, used under the Open Government Licence v3.0.

A worked example: tackling two long words

Your child reads: “The two friends had a disagreement about the technical drawing.” How can they read and understand the two long words?

Look for parts inside disagreement. The ending is -ment, which is a suffix. The start is dis-, a prefix. What is left is agree, a word they already know.
```
dis  |  agree  |  ment
```
Read the chunks one after another (dis, a-gree, ment) and then say the whole word smoothly.
Work out the meaning. Dis- often means “not” or “the opposite of”, so disagree is the opposite of agree. The ending -ment turns the action into a thing. A disagreement is what two people have when they don’t agree. This fits the sentence.
Now technical. Split it into tech, ni, cal. In the first chunk, try ch as in chip. It sounds like “tetch” and doesn’t match any word they know. Try ch as in school instead, and it becomes “tek-ni-kal”, which sounds like technology or technician.
```
tech | ni | cal
ch as in chip   → no word
ch as in school → tek-ni-kal
```
Check it makes sense. A technical drawing is an exact drawing that shows how something is made or how it works, such as a plan of a machine, so the meaning fits the sentence.

dis-a-gree-ment (what people have when they don’t agree) and tek-ni-kal (to do with how things are made or work, needing special knowledge).

Common mistakes and how to help

Believing a prefix always means “not”

The first prefixes children learn, un- and dis-, do mean not, so it feels like a rule. But re- means again, sub- means under, inter- means between and super- means above or beyond.

What helps: Treat the prefix as a clue to check against the sentence. In- is a good example: in incorrect and inactive it means not, but in inhale (breathe in) it means in or into.

Chopping off letters that only look like a prefix

Children who have learned re- or dis- start to see them in every word. Reindeer isn’t re- plus indeer, and disco isn’t dis- plus co.

What helps: Ask: if I take this off, is what’s left a real word, and does the meaning still fit? If not, it isn’t a prefix. Reading on in the sentence often settles it.

Reading long words letter by letter instead of in chunks

Sounding out every letter works for short words but loses track in long ones, and by the end the child has forgotten how the word began.

What helps: Cover the word and reveal it one chunk at a time. Look first for known words, prefixes and suffixes, then say them together. Modelling it yourself for one word first shows how it is done.

Pronouncing unusual words exactly as they are spelt

Words such as island, answer or guard follow no pattern children have been taught, so reading them letter by letter gives the wrong sound.

What helps: Try more than one pronunciation and choose the one that matches a word you’ve heard. Then point out the unusual letters: the silent s in island, the silent w in answer.

How to help at home

Chunk it while reading aloud. When your child gets stuck on a long word, don’t supply it straight away. Cover part of it with a finger and ask what they can see: a word they know, a prefix, a suffix. Then let them blend the pieces.
Build word families. Pick a root such as agree or appear and write out the family: disagree, agreement, disagreement, disappear, reappear. Talk about how each prefix or ending changes the meaning.
Hunt for prefixes in everyday places. Look for words such as supermarket, international or automatic on signs, packets and in books. Ask what the prefix might mean, then check with a dictionary together.
Try it two ways. When a word looks odd, say it in two different ways and ask which one sounds like a word you’ve heard before. This is exactly what teachers mean by testing out pronunciations.
Keep the focus on meaning. After a tricky word has been read, ask your child to explain it in their own words or to use it in a sentence. Reading a word and understanding it aren’t quite the same thing.

Builds on

Year 2: Longer words and suffixes
Year 2: Tricky words and fluent reading

Leads on to

Years 5 and 6: Roots, prefixes and suffixes in reading

Everything in Years 3 and 4 English

Updated 20 October 2026.