What if I don't understand the number they say?

Hand them your phone calculator or point to theirs. Or hand them a larger bill than you think it costs — the change you get back tells you the actual price. In tourist areas, most vendors are used to this.

Do I say this phrase in expensive restaurants too?

No. In sit-down restaurants with menus, prices are listed. Use this phrase in markets, street stalls, taxis without meters, souvenir shops, and anywhere prices aren't posted. If there's a menu, you don't need to ask.

Will people think I'm rude if I mispronounce it?

No. Making the effort in the local language is received positively almost everywhere. Vendors interact with foreign accents daily. A badly pronounced "how much?" is still better received than pointing and expecting them to speak English.

Should I negotiate after they tell me the price?

Depends on the country and situation. In markets in India, Morocco, Turkey, and much of Southeast Asia — yes, negotiation is expected. In Japan, Korea, or convenience stores anywhere — no, the price is the price. Watch what locals do.

What if they won't tell me and just expect me to pay?

This happens with taxis and guides sometimes. Don't get in the taxi or start the tour without confirming price first. Stand firm. If they won't name a price before service, walk away. There's always another option nearby.

How much does it cost? — Asking prices in any language

"How much?" is one of the most essential phrases you will use while traveling. Point at what you want and say the local phrase — in most places, sellers will show you the price on a calculator, write it down, or use fingers. Even a badly pronounced attempt works better than none.

Learn the phrase before you need it. Memorize "how much?" in the local language before you leave your accommodation. Practice it 10 times out loud. Write it phonetically in your phone notes. Most languages have a short, simple version for this — often just 2-3 syllables.
Point and ask. Point at the item, make eye contact, and say the phrase. You do not need perfect pronunciation. The context — you pointing at something in a shop or market — makes your meaning clear.
Get the number. The seller will show you the price. Common methods: calculator, written on paper, fingers, or speaking it aloud. If spoken, ask them to write it down or show on calculator. Gesture writing on your palm if needed.
Have small bills ready. Keep small denomination bills accessible. When you hear or see the price, hand over slightly more than needed. You will get change back, which helps you learn the currency faster than exact payment.

What if I don't understand the number they say?: Hand them your phone calculator or point to theirs. Or hand them a larger bill than you think it costs — the change you get back tells you the actual price. In tourist areas, most vendors are used to this.
Do I say this phrase in expensive restaurants too?: No. In sit-down restaurants with menus, prices are listed. Use this phrase in markets, street stalls, taxis without meters, souvenir shops, and anywhere prices aren't posted. If there's a menu, you don't need to ask.
Will people think I'm rude if I mispronounce it?: No. Making the effort in the local language is received positively almost everywhere. Vendors interact with foreign accents daily. A badly pronounced "how much?" is still better received than pointing and expecting them to speak English.
Should I negotiate after they tell me the price?: Depends on the country and situation. In markets in India, Morocco, Turkey, and much of Southeast Asia — yes, negotiation is expected. In Japan, Korea, or convenience stores anywhere — no, the price is the price. Watch what locals do.
What if they won't tell me and just expect me to pay?: This happens with taxis and guides sometimes. Don't get in the taxi or start the tour without confirming price first. Stand firm. If they won't name a price before service, walk away. There's always another option nearby.