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How to convert Fahrenheit to Celsius without a calculator.

Exactly: Celsius equals (Fahrenheit minus 32) times 5/9; water freezes at 32 °F, boils at 212 °F. In your head: subtract 30, halve it. 70 °F becomes 20 °C, exactly 21. Anchors: 50 °F is 10 °C, 86 °F is 30 °C, −40 is −40. Besides the USA, only Liberia, the Caymans and a few Caribbean states use Fahrenheit.

Useful: For a US forecast: anything over 90 °F is a hot day, anything under 32 °F is frost.

Source: en.wikipedia.org

MasseinheitenTemperaturUsa

Difficulty:

Question on this card

At what temperature do Fahrenheit and Celsius show the same number?

  1. 0
  2. −40
  3. 32
  4. 100
Show the answer

Correct: −40

−40 °F is exactly −40 °C; it follows from the formula (F − 32) × 5/9.

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