ConceptCONCEPTMind Your Future
Part Two · Building accuracy · Level B1

Unit 21
Thirteen and thirty

/θɝˈtin/ /ˈθɝɾi/
Worksheet W21
From your coach. One tiny difference, a lot of misheard numbers. This is the unit that saves you on the phone.
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These are the symbols you will see in a dictionary. Click any one to hear it. You do not need to memorize them.

Why this mattersThe most expensive small unit in the book

This is a small unit with a large practical cost.

Thirteen and thirty are different numbers. So are fifteen and fifty, forty and fourteen. If your listener cannot tell them apart, you have misquoted a price, a quantity, a deadline or a room number, and neither of you will notice until something goes wrong.

In purely commercial terms this is the most expensive error in the book.

In commercial terms, the most expensive error in the book.

What your language doesThe endings will not save you

The endings differ, -teen against -ty, but in fast speech the difference is small and unreliable. English speakers do not depend on it.

The stress is what carries it. ThirTEEN has the beat on the second syllable. THIRty has it on the first.

If your language does not use stress to distinguish words, you will produce the two with the same rhythm, and then only the ending is left to carry the load. In a noisy room or on a phone line, it will not.

A second problem: the American t. In thirty the t is a flap, so it sounds almost like a d. THIRdy. If you produce a crisp t there, you sound careful rather than American, and you also lose one more cue that would have helped.

Common trap

The endings will not save you. Stress carries it: thirTEEN leans forward, THIRty leans back. And thirty has a flap t: THIRdy.

How to make itThe teens lean forward, the tens lean back

The teens: strong on the second syllable, and the ending is clear. ThirTEEN, fourTEEN, fifTEEN.

The tens: strong on the first syllable, and the ending is weak and flapped. THIRdy, FORdy, FIFdy.

The way in. Say them in pairs, exaggerating the beat, and tap the table on the strong syllable so you can feel the difference physically.

Then test it for real. Say a price or a quantity from your own work, record it, and play it to a colleague without telling them the number. If they get it wrong, the beat is the thing to fix, not the ending.

Try this now

Say a price or a quantity from your own work, record it, and play it to a colleague without telling them the number. If they get it, you have it.

Side view of the mouth, showing how the sound is made

Train your ear

I play one word. Tap the one you heard. No speaking yet, just listening.

Tap play to start.
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Minimal pairsThe two words, side by side

Play each pair deliberately and feel the one difference. This is where the sound stops being abstract.

Say itWord banks

The teens

The tens

In a sentencePut it under pressure

Record and compareSee the shape of your voice

Pick anything above, then record yourself saying it. Your recording appears in red over the model in gray. You are comparing shapes, not chasing a score.

Choose a word or sentence above
ModelYou
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Check yourself

On a bad phone line, which tells your listener you said fifty and not fifteen?

The stress. The endings are too small to survive noise, but the beat pattern carries.