640 f to c

Step 1: Identify the conversion factor

The conversion factor from fahrenheit to celsius is:

1 fahrenheit = 0.528 celsius

Step 2: Set up the calculation

To convert 640 fahrenheit to celsius, multiply 640 by the conversion factor 0.528:

640×0.528

Step 3: Calculate

640×0.528=337.778

Step 4: Round the result

The result is approximately: 340 celsius

Final Answer:

640 fahrenheit is approximately 340 celsius.