20000
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It is 600.
The first digit is 1, in the tens place. So the front end estimate is 10.
400
In estimation, 5.9 can be rounded to 6. When rounding to the nearest whole number, if the digit to the right of the decimal point is 5 or greater, you round up. Therefore, 5.9 would round up to 6.
To the nearest hundred, 900