How do I check for reasonableness in math?

To check for reasonableness in math, start by estimating the expected range of the answer based on the numbers involved. You can round numbers to make mental calculations easier and see if the result falls within a plausible range. Additionally, consider whether the answer makes sense in the context of the problem—does it align with your understanding of the situation? Finally, if applicable, you can verify your result using a different method or calculation to confirm consistency.