Q: What is one good reason why 2700 is not a good estimate for 903 times 29?

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No

I suggest 290*9 = 290*(10-1) = 2900 - 290 = 2900 - 300 = 2600The exact answer is 2592.

10 times 351 = 3510 The real answer will be 351 more than that. Estimate 3861

It would be if 0.09 rounded to 1. But since 0.09 rounds to 0.1, estimate 0.3

0.35

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No

There is no good reason. There are times when you would and times when you would not.

It's off by an order of magnitude. Should be near 27,000, not 2,700. Checking now... it's 26,187, to be precise.

I suggest 290*9 = 290*(10-1) = 2900 - 290 = 2900 - 300 = 2600The exact answer is 2592.

10 times 351 = 3510 The real answer will be 351 more than that. Estimate 3861

the answer would have had 5 digits

3 is not a good estimate for 3.4 times 0.09 because, the result of 3.4 times 0.09 is 0.306.

21,000

2700 Bloons Its pricey but Good :)

The answer being 0.5456, the digit 2 can not be a good estimate since it is not close.

If I assume that you're talking about 158 / 41 then my quick answer is yes, it is a good estimate. 4 times 41 is 164 which is closer to 158 than 3 times 41 (123) and 5 times 41 (205). Final summary: 4 is a good estimate for 158 / 41 because it is the closest whole number to the real answer.

A good reason to learn scientific notation.