6.3: Estimate Quotients Using Compatible Numbers

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What are compatible numbers?

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Compatible numbers are numbers that are easy to compute with mentally. They are often rounded numbers that make calculations simpler.

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90

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80

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70

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50

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500

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How do you round numbers to find compatible numbers?

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To round numbers, look at the digit to the right of the place you are rounding to. If it's 5 or more, round up; if it's less than 5, round down.

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What is the purpose of estimating quotients?

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Estimating quotients helps to quickly determine a reasonable answer without performing exact calculations.

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50

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80