Phone numbers & prices

Two places numbers attack you daily: phone numbers, read digit by digit — and prices. Ask Wie viel kostet das? (How much is that?) and hear answers like:
- 2,80 € → zwei Euro achtzig
- 1,50 € → ein Euro fünfzig
- 0,50 € → fünfzig Cent
The written price uses a comma; the usual short spoken form puts Euro in the middle and drops the word Cent. (The long form zwei Euro achtzig Cent is correct too.)
On the phone, some people read their number in pairs instead: 23 58 = dreiundzwanzig, achtundfünfzig.
Tip
The short price formula skips the word Cent: 2,80 € = zwei Euro achtzig. With no euros you say Cent: fünfzig Cent.