Lesson · M.5.2
Military time, Roman numerals and temperature
How to convert 12-hour clock time to military time, read Roman numerals, and convert between Celsius and Fahrenheit for the HESI A2 math subtest.
ObjectiveM.5.2Read5 minExam weightMeasurement and Conversions ≈ 12% of Mathematics
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- Convert a 12-hour clock time to military time and back, including midnight and noon.
- Read and write the Roman numerals used on charts and medication labels.
- Convert a temperature between Celsius and Fahrenheit using the two standard formulas.
What the lesson concludes
- Military time never uses AM or PM, and it always shows four digits.
- For AM hours 1 through 9, add a leading zero. For PM hours, add 12 to the clock hour.
- Midnight is 0000 and noon is 1200, not 1200 and 2400.
- Roman numerals are read by adding values left to right, except when a smaller value sits before a larger one, which means subtract.
- Fahrenheit equals Celsius times nine fifths plus thirty two, and the reverse subtracts thirty two first, then multiplies by five ninths.