400 is the closest.
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It is 450.
To round off 449 to the nearest 100, we look at the digit in the tens place, which is 4. Since 4 is less than 5, we keep the hundreds place digit the same and change all digits to the right to zero. Therefore, rounding 449 to the nearest 100 gives us 400.
It is: 97
factors: 1, 449prime factors: 449
The closest estimate is the exact answer. For any other estimate, you can do better with more effort.150*83 = approx 100*3/2*82 = 100*3*41 = 100*3*40 = 12000.