926
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i think it would be about 700
687
-239
6 plus 2 makes 8, thats the front
87 plus 39 is about 1, thats the end
so 8 - 1 is... about 700
2,000. A front-end estimation just means to round it by the greatest value, in this case the thousands.
It is 200.
It is 10000.
Some of the estimation strategies are: Front-End Strategy and Closest-Ten Strategy (or rounding).
By using front end estimation, the numbers that you start of with have only one significant digit. It is, therefore, nonsense to have an answer with loads of significant digits.