it would not be a good time to estimate mixed numbers is when both of the fractions are not a mixed number
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Estimating mixed numbers may not be a good idea when precise measurements are crucial, such as in scientific experiments or architectural designs. In these situations, even small errors in estimation could lead to significant inaccuracies. Additionally, when dealing with financial transactions or recipe measurements, estimating mixed numbers could result in incorrect amounts, leading to financial discrepancies or unsatisfactory outcomes. Therefore, it is important to use exact calculations for accurate results in such scenarios.
Engineering
When estimating with compatible numbers, you look for numbers that are close to the original values but easier to work with. For 231, you could round it to 200 to simplify calculations. So, when using compatible numbers, 231 would be estimated to 200.
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First convert them t top-heavy fractions. Treat these as you would ordinary fractions: find common denominator and so on. At the end, convert the top heave fraction back to a mixed fraction.