It is 10000.
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Front end rounding is using the first or the first two digits to make an estimation. 37145 would be rounded to 40000.
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.
Frond end estimation.
Front end rounding is taking the first digit and making the rest 0. 75 would be 70 in front end rounding.