What is the formula for converting Celsius to Fahrenheit?

• A. Add 32 then multiply by 2
• B. Multiply by 1.8 and add 32
• C. Subtract 32 and divide by 1.8
• D. Multiply by 0.5 and add 9

Answer: (B)

Converting Celsius to Fahrenheit involves changing both the size of each degree and the starting point on the scale. Each degree Celsius corresponds to 1.8 degrees Fahrenheit, and the freezing point is 0°C = 32°F. So you multiply the Celsius value by 1.8 and then add 32. In formula form: Fahrenheit = Celsius × 1.8 + 32 (which is the same as Celsius × 9/5 + 32).

This is the form that correctly maps values like 0°C to 32°F and 100°C to 212°F. The other options don’t match this relationship: multiplying by 2 then adding 32 uses the wrong slope; subtracting 32 and dividing by 1.8 converts Fahrenheit to Celsius; multiplying by 0.5 and adding 9 does not reflect the actual scale.