A number without its denominator is barely a number at all. A figure like two hundred cases means something completely different in a city of two million than in a town of two thousand, yet headlines routinely report the top line and leave the underlying base for the reader to guess.
This matters most when comparing across time or place. A rising count can simply reflect a growing population, more testing, or better reporting rather than a genuinely worsening situation, and a falling count can hide the opposite. The rate, not the raw figure, is what actually describes the trend.
The fix is a habit rather than a special skill: before reacting to a total, ask what it is a share of, and of what. That single, unglamorous question, asked consistently, quietly filters out a large share of the misleading numbers that circulate day to day, without needing any special expertise.