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Mathematics in the fourth grade of primary school: What is the divisor of 609?
What is the approximate number of 609? It means to take a rough number.

Approximate ten digits: the approximate number of 609 can be regarded as 6 10.

A few hundred: 609 The divisor can be regarded as 600.

On this issue, I think 600 and 6 10 are both right. But the correct rate of 600 is higher, because in general, the number around the whole hundred is estimated as the whole hundred.