Class Name: Grade:

I. Oral calculation: (***6 points, separate volume)

2. I believe you can fill it in correctly: (14)

(1) Two million four hundred and ninety-five thousand words (20495000), and the mantissa after omitting "ten thousand" is (2050).

(2) The highest digit of 92,000,000 is (ten million), and the number rewritten as "ten thousand" is (92,000,000).

(3) Arrange the following figures in descending order:

440050 440,000 46500 440500 439500

(46500)& lt； (439500)& lt； (440，000)