What are landmark numbers?

Landmark numbers are specifically identified as numbers that are easy to work with, particularly in mathematics and estimation. They serve as reference points that simplify calculations, making it easier to round numbers for mental math or basic arithmetic. For instance, numbers like 10, 100, 1,000, or even common fractions like 0.5 or 0.25 are considered landmark numbers because they can help facilitate calculations or provide a reasonable estimation in various problem-solving situations.

Using landmark numbers allows individuals to quickly and accurately make sense of numerical information without needing precise calculations, ultimately aiding in effective mathematical reasoning.