Choice Choice B is the correct answer. Working with the nice round number 100 makes this calculation straightforward.

1. Start with the equation: $x + 52 = 100$
2. Subtract 52 from both sides: $x = 100 - 52$
3. Calculate: $x = 48$
4. Verify: $48 + 52 = 100$ ✓

💡 Complementary Numbers: Notice that 48 and 52 are complements—they add up to 100. This is a useful mental math skill.

Choice Choice B is incorrect because this results from adding instead of subtracting: $100 + 52 = 152$. We need to undo the addition, not add more.

Choice Choice A is incorrect because this confuses the constant term (52) with the solution. The number being added to $x$ is not the value of $x$ itself.

Choice Choice D is incorrect because this results from dividing: $\frac{100}{52} \approx 1.92$. Division is not the appropriate operation for this addition equation.