estimate the sum and difference 8547 and 4573
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8547 can be estimated as 8500
And 4573 can be estimated as 4500
Now, sum = 8500+4500=13000
Difference =8500-4500=4000
And 4573 can be estimated as 4500
Now, sum = 8500+4500=13000
Difference =8500-4500=4000
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