estimate 4,867,010 times 27.058, using principle of estimation, show work?

Answer 1

I would round 4,867,010 to 5,000,000 first...

Then I would round the 27 down to 25.00

5,000,000 x 25,000 = 125,000,000 (this is my lower bound)

Then I would round the 27 up to 30.00

5,000,000 x 30,000 = 150,000,000 (this is my upper bound)

This tells me that 4,867,010 times 27.058 will result in a number that falls between 125,000,000 and 150,000,000

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You could have also rounded 4,867,010 to 5,000,000...
and the 27.058 to just plain 27...

5,000,000 x 27 = 135,000,000....

because 4,867,010 was rounded up (or you could also say that 4,867,010 is a little under 5,000,000), you know that your number falls a little under your estimate of 135,000,000

Answer 2

Your actual answer is 131,691,556.58. To estimate it, I would round off the full number 4,867,010 to 4,900,000 and round off the multiplier to the nearest whole number or 27. The answer then would be 132,300,000 or 132.3 million. To find the average number, you divide the larger number by 2, and add the answer to the smaller number.