Chinese · Pronunciation Guide
"oo" with tightly rounded lips, sunk to the bottom of your voice. No consonant at all — the w in the pinyin is a spelling convention.
wǔ
As a lone third tone it dips fully, but 五 sits in a genuinely awkward numerical neighbourhood: in wǔ diǎn and wǔ běn a following third tone makes it rise to a second, while in wǔ tiān or wǔ kuài it stays low. Because numbers are so often followed by measure words, the sandhi comes up constantly.
Listen: 五
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我有五块钱。
Wǒ yǒu wǔ kuài qián.
I have five yuan.
Listen: 我有五块钱。
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我有五块钱。 opens with wǒ yǒu, two third tones in contact, so wǒ becomes rising. Then wǔ is followed by kuài, a fourth tone, so it keeps its full low dip. That gives you a rise, a dip, another dip, a hard fall and a rise — five syllables, five different pitch movements, and a good drill for hearing the difference between rising and dipping.
Learners often round the lips only halfway and produce something between "oo" and "uh", which blurs the syllable toward the tone-less filler sounds. Push the lips forward deliberately. The tone error is subtler: because the syllable has no consonant to launch it, the pitch tends to start mid and stay mid, which reads as a light first or second tone rather than the deep dip you want.