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The best way to estimate a quotient using compatible numbers is to first understand how compatible numbers work. They are numbers that are close in value to the actual numbers and are easily added, subtracted or divided.
rounding numbers is to nearest ten or hundred and compatible numbers are when you can do nearest 5
Compatible numbers are numbers that are close in value to the actual numbers and easy to add, subtract, multiply, or divide mentally.So a logical compatible number for 77 would be 80.
420
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.