Roman Numerals & Military TimeHESI A2 cheat sheet

Two notations used on orders

8 key facts 5 practice questions Reviewed Oct 2026

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Roman Numerals

I=1 · V=5 · X=10 · L=50 · C=100 · D=500 · M=1000
Smaller before larger subtracts: IV = 4, IX = 9
Smaller after adds: VI = 6, XII = 12

Military Time

Four digits, no colon, 0000–2359
Add 12 to afternoon hours: 3 PM = 1500
Midnight = 0000; noon = 1200

Converting Back

Subtract 12 from 1300 and above for PM

Why

Both appear on medication orders and schedules

Key takeaway

Two notations used on orders

Before you read

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Question 1 of 5

A car travels 180 miles in 3 hours. What is its average speed?

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