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Compatible numbers are numbers that look nice or friendly with each other when we do mental calculation to estimate a product, but especially a division. You can estimate them by looking at your problem and rounding whatever numbers you have. This may sound confusing at first but practice makes perfect.
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Answer: Answer: Compatible numbers are pairs of numbers that are easy to add, subtract, multiply, or divide mentally. When using estimation to approximate a calculation, replace actual numbers with compatible numbers. The numbers 500 and 300 are compatible for addition, since the sum of 800 can be easily calculated mentally.

Step-by-step explanation:

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