The best estimate is always the exact answer since it is always possible to improve upon any other estimate.
60 x 30 = 1800
It is 30.
It is 71 + 30 = 101.
To the nearest ten, 30 cm
31
960 x 30 = 28800
290 - 30 = 260
About 30 inches
If you added two numbers and got the right total, you didn't need an estimate, reasonable or not.
The answer = 3520
To determine if 2750 is a reasonable answer for 917 multiplied by 33, we can estimate the result using rounding. Rounding 917 to the nearest hundred gives us 900, and rounding 33 to the nearest ten gives us 30. Multiplying 900 by 30 gives us 27,000, which is close to 2750. Therefore, 2750 is a reasonable estimate for the product of 917 and 33.
3520.
it is 640 kilometer per hour
The best estimate is always the exact answer since it is always possible to improve upon any other estimate.
5 squared is 25, and 6 squared is 36. So the square root of 30 has to be between 5 and 6. Since 30 is fairly close to midway between 25 and 36, 5.5 would be a reasonable estimate. (My calculator tells me that the answer is approximately 5.477, so 5.5 is quite good.)
6x5=30 sq in I would hope this would be one of the choices.