HOSA Medical Math Assessment Practice Test

The formula to convert Fahrenheit to Celsius is correctly identified as C = (F - 32) × 5/9. This formula reflects the relationship between the two temperature scales. When converting temperature from Fahrenheit (F) to Celsius (C), the first step is to subtract 32 from the Fahrenheit temperature. This adjustment accounts for the fact that the zero points of the two scales differ significantly; for example, 32°F is the freezing point of water, while 0°C is the same point on the Celsius scale. Next, multiplying by 5/9 scales the result appropriately, aligning it with the Celsius value. The factor of 5/9 is derived from the ratio of the intervals or degrees between the two scales: there are 180 degrees between the freezing and boiling points in Fahrenheit compared to 100 degrees in Celsius. Using the other formulas would lead to incorrect conversions. For instance, adding or incorrectly using the fractions with 9 in the numerator would not yield a correct Celsius temperature, since these adjustments do not align with the actual temperature interval conversions between the two scales.