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I don't understand the math doubts in the first grade! (Approximation and significant figures)
The approximate number is 350,000, accurate to _ _ ten _ _ places. There are _ _ 2 _ _ valid numbers. If expressed by scientific counting method.

It should be recorded as _ _ 3.5 * 10 (-2) _ _ ten thousand.

1.40× 10 5 is accurate to _ _ thousand _ _ bits. There are __3__ valid numbers. They are _ _ 1, 4, 0 _ _.

Analyze the last two questions?

How to calculate the significant number?

A valid number is a number that starts from the left and is not 0.

From now on, everyone will count (including 0).

Such as 0. 1056843265.

What's the valid number?

The first non-zero here is the decimal 1.

So there is 10, which means 1056843265.

0.0 1000002

Starting from the percentile of 1, there are 1000002 and 7.

0. 1050605

There are seven more, 1050605.

Supplementary question: 0.0350000

3.35 million cases, 6.