Sì vs Shí: How to Stop Mishearing 4 and 10 in Chinese

四 (sì, 4) and 十 (shí, 10) are the most confusable pair in the whole Chinese number system. They are a genuine listening minimal pair: one syllable each, similar consonants, and they sit in the same slots inside larger numbers. Mishear one for the other and a price, a phone digit, or an address changes completely. Native speakers know it too, which is why one of the most famous tongue twisters in the language is built on exactly these two words.

This guide covers the two cues that reliably separate them, the compound traps like 14 vs 40, and the training method that makes the difference automatic.

Countfu is Chinese numbers listening practice: hear a number in Mandarin, type the digits. Coming soon.

Why 4 and 10 in Chinese sound so close

Both words are single syllables ending in the same vowel territory. The differences live in just two places:

• Tone. 四 sì carries the 4th tone: a sharp, decisive fall, like a firm "no!". 十 shí carries the 2nd tone: a rise, like the pitch of an English question. Falling means 4. Rising means 10.
• The consonant. 四 starts with a plain s, tongue near the teeth, like English "sir". 十 starts with the retroflex sh, tongue curled back, closer to English "shirt" but darker.

Two cues sounds like plenty. The catch is that at conversation speed each syllable lasts a fraction of a second, and one of the two cues is not always there, as you will see below. Your ear needs both, with the tone as the anchor.

The tongue twister that proves the point

Chinese children grow up on this one:

四是四，十是十，十四是十四，四十是四十
(sì shì sì, shí shì shí, shísì shì shísì, sìshí shì sìshí)
"4 is 4, 10 is 10, 14 is 14, 40 is 40."

Every content word in the sentence is sì, shí, or the verb 是 (shì, "is"). If native speakers needed a national exercise to keep these syllables apart in their own mouths, a learner should expect the listening version to take real work. That is the honest takeaway from the twister: this pair is hard for everyone at first, and the fix is reps, not talent.

The real trap: 十四 vs 四十

In isolation, a wrong guess between 4 and 10 costs you 6. Inside compounds it costs much more, because the same two syllables in opposite order are different numbers:

The logic is clean: a digit before 十 multiplies it, a digit after it adds to it. So shísì is 10 plus 4, which is 14, and sìshí is 4 tens, which is 40. 四十四 sìshísì (44) stacks both rules and forces your ear to track three near-identical syllables in a row, telling them apart by tone alone: falling, rising, falling.

This trap appears constantly because 14, 40, and 44 show up in prices, bus routes, room numbers, and ages. There is no rare-word discount here. You meet sì and shí in nearly every transaction.

When the consonant cue disappears, trust the tone

Here is why you should not build your listening strategy on s vs sh: large parts of the Chinese-speaking world do not make that distinction. Southern-accented Mandarin commonly merges s and sh into a single sound, so 四 and 十 can start identically. In Taiwan, much of southern China, and plenty of overseas communities, the consonant cue is simply gone.

The tone survives. Even in accents that flatten the s/sh contrast, sì still falls and shí still rises. That makes tone the robust signal, the one worth wiring into your reflexes first.

The practical order for learners: train on Standard Mandarin (Putonghua) audio first, where both cues are present and clean, and let your ear learn to weight the tone heavily. Accent variants are a later step, and by then the tone habit carries you.

There is no 十千: when context helps and when it does not

One structural fact occasionally rescues you. Chinese has no "ten thousands" built from 千 (qiān, thousand). There is no 十千; ten thousand is its own unit, 一万 (yíwàn). So if you hear something-qiān and you are unsure whether the something was sì or shí, it had to be 四千 (sìqiān, 4,000), because shí qiān is not a word.

Do not get comfortable, though. One step up the ladder the safety net vanishes: 四万 (sìwàn, 40,000) and 十万 (shíwàn, 100,000) are both perfectly normal words, separated by nothing but that one syllable. Mishear it and you are off by a factor of 2.5 on a salary or a rent figure. Unit context sometimes disambiguates and sometimes does not, which is exactly why the syllable itself has to be solid.

How to train 4 and 10 in Chinese until it is automatic

Knowing the theory does not survive contact with real speech. The difference between sì and shí arrives in under half a second, and your ear has to resolve it before the next syllable lands. That kind of speed only comes from focused listening reps:

• Start with the bare minimal pair. Hear sì or shí in isolation, answer 4 or 10, get instant feedback. Slow audio first, so the tone shape is obvious.
• Move to the compounds. Mix 14, 40, and 44 with plain 4 and 10, so order starts to matter and you cannot pattern-match on length.
• Increase the speed. Native-rate audio compresses the tones. If you trained only on slow recordings, fast speech will undo you. Push the tempo up step by step.
• Score every answer. Typed digits are unforgiving: 14 is not 40, and a score tells you the truth about your ear. Review the misses, because they cluster exactly where your weighting of tone vs consonant is wrong.

A few hundred scored reps of this pair, at increasing speed, settles it for most learners. The goal is that a falling s-syllable lands as 4 and a rising one lands as 10 with no conscious step in between.

Related reading

• Chinese Numbers 1 to 100: A Listening Guide: the full foundation this pair lives inside.
• Chinese Phone Numbers: Why 1 Is Pronounced Yāo (幺): the other substitution trick used to keep digits apart.
• Telling Time in Chinese: Why 两点 Is 2:00, Plus 半, 刻, and 差: clock numbers, where 4:00 and 10:00 keep this pair relevant.

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