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How Do You Estimate a Quotient Using Compatible Numbers?
Estimate the quotient of 55,304 ÷ 875 by using compatible numbers.
Summary
- Compatible numbers are numbers that are close to the numbers they're replacing that divide evenly into each other
- The quotient is the result you get when you divide
- 56,000 is pretty close to 55,304
- 800 is pretty close to 875, AND it divides evenly into 56,000
- Divide the non-zero parts of each number, 56
÷ 8, to get the first part of the estimate - Then add on however many zeros were left in the problem to get your estimate
- In this case, we had one zero left so the estimate is 70

Notes
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- Compatible numbers are numbers that are close to the numbers they're replacing that divide evenly into each other
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- When we estimate we're trying to make the problem easier, so we can solve it without doing calculations
- Dividing is easier when we have numbers that divide evenly into each other, so that's how we'll estimate
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- 56,000 is like 560 times 100
- 800 is like 8 times 100
- When we divide 56,000 by 800, we can cancel out the 100's, and we're left with 560 divided by 8
- In other words, since there are two zeroes in the divisor, we cancel out two zeros in the dividend
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- Since we rounded the dividend and divisor into such nice numbers, we can easily divide the front digits to get a round number!
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- Since we canceled a few zeroes, there's only one zero left
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- There are usually more than just one pair of compatible numbers to choose from
- As long as the numbers are easily divisible and close to the original numbers, they'll be good compatible numbers!
- We'll get a slightly different answer, but it's still a good estimate of our quotient