2700 = 900 * 30 in which both multiplicands have been replaced by larger estimates.
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
No, 3 is not a good estimate for 3.4 times 0.09. To estimate the product of 3.4 and 0.09, you can round each number to the nearest whole number, which would be 3 and 0 respectively. Multiplying 3 by 0 gives you 0, which is significantly different from the actual product of 3.4 times 0.09, which is 0.306.
0.35
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
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.
A good reason to learn scientific notation.
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.
No, 3 is not a good estimate for 3.4 times 0.09. To estimate the product of 3.4 and 0.09, you can round each number to the nearest whole number, which would be 3 and 0 respectively. Multiplying 3 by 0 gives you 0, which is significantly different from the actual product of 3.4 times 0.09, which is 0.306.