What are some situations in which estimating a sum or difference is useful?

Estimating a sum or difference is useful in situations where quick decision-making is required, such as budgeting or shopping, where knowing approximate totals can help determine affordability. It is also beneficial in mental math scenariOS, like gauging distances or travel times, allowing for efficient planning without needing precise calculations. Additionally, in fields like project management, estimating can help assess resource allocation and timelines without getting bogged down in exact figures.