When would you use compatible numbers to estimate the value of an expression?

Answer 1

say you estimate5.21 x 78.03 you can estimate by the whole number so the 5 stays the same and 78 turns to 80 so it should look like this 5x 80=400 ,so 5.21 x 78.03 =400. SO what i did was use the compatible numbers 5 and 80

Answer 2

Compatible numbers are used to simplify calculations by choosing numbers that are easy to work with. You would use compatible numbers to estimate the value of an expression when you want a quick approximation without needing to calculate the exact answer. It's especially helpful when dealing with numbers that are close to each other or when you need to perform mental math quickly.

Answer 3

It is most useful for finding quotients because it works with multiples.