Decoding multisyllabic words: how to teach it

Why do long words stop so many readers?

Most students who read one-syllable words well hit a wall around third grade. Texts suddenly fill with words like important, remember, information and celebrate. A student who could blend every sound in a short word now faces ten letters in a row and no idea where to start. Many respond by reading the first few letters and guessing the rest.

The guess works just often enough to become a habit. A student sees conversation, notices con and says conversion or concentration, then keeps going. Their comprehension suffers, and they often have no idea that the word they said was wrong. Over a year, those guesses add up to a lot of misunderstood text.

The good news is that long words are built from the same patterns as short ones. Teach students how to break a word into pieces they already know how to read, and most of the wall comes down. The What Works Clearinghouse guides for both K-3 and grades 4-9 recommend exactly this kind of direct teaching.

What is a syllable, for teaching purposes?

A syllable is a part of a word with one vowel sound. Cat has one syllable. Picnic has two: pic and nic. Fantastic has three. The key word is sound. Boat has two vowel letters but one vowel sound, so it has one syllable. Cake has two vowel letters but the e is silent, so it is one syllable too.

That gives students a quick way to count syllables in print: find the vowel sounds. Each vowel sound means one syllable. Counting syllables before reading tells a student how many pieces they are looking for, which is often enough to slow down a guesser and get them reading through the whole word.

What routine works for decoding long words?

A good routine is short, the same every time, and works on most words. Here is the one I teach, adapted from several research-based versions. It moves from the parts students can spot easily to the parts that take more thought.

1. Look at the whole word. Is there a part you already know, like a compound word?
2. Circle any prefix at the start and suffix at the end.
3. Underline the vowels in what is left. Each vowel sound is one syllable.
4. Divide the word into syllables using the patterns you know.
5. Read each syllable, left to right.
6. Blend the syllables together.
7. Check: is it a real word that makes sense? If not, flex a vowel sound and try again.

Bhattacharya and Ehri tested a version of this with struggling readers in middle school. Students who practiced dividing words into syllables, saying each part and matching it to the letters, read and spelled new words better than students who practiced reading whole words. The act of breaking words apart, out loud, made the difference.

What does it sound like in a lesson?

The routine looks slow written down. In practice it takes a few seconds once students are used to it, and after enough repetitions, most of it happens silently. Students stop needing every step and use only the ones a word requires.

Which syllable patterns should students know?

Students need two kinds of knowledge to divide words: the syllable types, which tell them how a vowel will sound in a syllable, and the division patterns, which tell them where to split. Both build on phonics they already have.

The most useful division patterns are splitting between two consonants (nap and kin), splitting before a single consonant (ti and ger) or after it (cam and el), and counting back three letters for consonant-le (ta and ble). Most two and three syllable words in grade 2 and 3 books fit one of these.

Why do students need to flex vowel sounds?

Because syllable rules get the student close, not always all the way. In longer words, unstressed syllables often relax into a schwa sound, so the a in about or the o in lemon does not sound like the rules predict. A student who reads 'lem-on' with a crisp short o will get something close, and they need to adjust it to the real word.

Flexing is the step where the student says the word as decoded, then asks whether it sounds like a word they know. If not, they try a different sound for one of the vowels, usually long instead of short, or a lazy /uh/. This depends on vocabulary, which is one reason oral vocabulary matters so much for decoding long words.

Where do prefixes and suffixes fit in?

Early. Word parts are often the fastest way into a long word because they are spelled the same way in hundreds of words. A student who instantly sees re, un, dis, ing, ed, ful and tion has removed a big chunk of the problem before they even divide the rest.

Morphology also helps with meaning. Knowing that un means not and able means can be turns unbelievable from a string of letters into something like cannot be believed. That link is one reason older students who learn word parts often make gains in both reading and vocabulary at the same time.

• Common prefixes to teach first: un, re, dis, in, pre, mis.
• Common suffixes to teach first: s, es, ed, ing, er, est, ly, ful, less, ness, tion.
• Teach that a suffix can change the spelling of the base, as in hop and hopping.

When should teaching start?

Start with two-syllable compound words and simple closed syllable words, like sunset and napkin, late in first grade. Move through the syllable types and division patterns in second grade as each phonics pattern is taught. In third grade and up, put the full routine to work with words from science and social studies texts.

Older students who struggle with long words need the routine too, and they often pick it up fast. I have seen fifth graders go from guessing to reading through words within a few weeks of daily practice. The key is giving them words that matter in their own classes, so the payoff is obvious to them.

What practice builds long-word reading?

Daily, short and with real text. Ten minutes a day of dividing and reading words, followed by reading a passage with several long words, does more than any amount of worksheets. Have students mark up words with a pencil at first, then do it in their heads.

• Word sorts by syllable type, using two-syllable words.
• Building words from syllable cards: pic plus nic, mag plus net.
• Reading lists of long words taken from the next science chapter before the class reads it.
• Spelling long words by syllable: say each part, spell each part.
• Rereading passages with long words to build speed.

Use real words from upcoming texts whenever you can. Preteaching five tough words from tomorrow's chapter gives students practice with the routine and a better chance of understanding what they read the next day.

Spelling long words is the other half of the practice, and it is easy to skip. When students spell a word like fantastic by saying each syllable and writing it before moving on, they build the same habit of breaking words into parts. Bhattacharya and Ehri found that this kind of syllable work helped spelling as well as reading. Two or three long words in each day's dictation are enough to keep the skill growing.

What are the limits of syllable rules?

Syllable division rules are a tool for reading, and they do not always match how dictionaries divide words. A dictionary might split a word one way based on its origin or meaning, while a reading rule splits it another way that is easier to sound out. For teaching, the reading split is fine. What matters is that the student gets to the right word.

Some teachers spend weeks on labeling syllables with codes and markings until students are better at labeling than reading. That is a trap. Labels help at first, but the goal is reading long words accurately and quickly. Once a student can do that, drop the markings and keep the reading.

Vocabulary sets the last limit. A student can divide and sound out a word perfectly and still not recognize it, because they have never heard it. Decoding gets them a pronunciation; meaning has to come from somewhere else. That is why long-word teaching works best paired with vocabulary teaching, especially in content subjects where the words are new to everyone.