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First, fill in the blanks.
1. From units to hundreds of billions (), () is the first level, () is the million level, () is the billion level, and the progress between adjacent counting units is ().
2. 1989030600 is () bit, the highest bit is () bit, pronounced as (), and the mantissa after omitting 100 million bits is about () billion.
3. Decimal number consists of eight natural number units, five tenths and twenty-two thousandths. This number is written as () and read as (), and its counting unit is ().
4606 million yuan is written as (), rewritten as () in units of "ten thousand", with mantissa () after omitting ten thousand, and accuracy ().
5. The difference between two adjacent natural numbers is (). A natural number is neither a prime number nor a composite number, and the two adjacent natural numbers are () and ().
6. Moving the decimal point 0.625 to the left by two places is (), which is reduced by () times.
7. The sum of five consecutive odd numbers is 200, and these five odd numbers are (), (), (), () and () respectively.
8. The product of two numbers is 70, one factor is enlarged by 100 times, and the other factor is reduced by 10 times. The product is ().
9.a÷ 12=c, and the divisor is expanded by 5 times. In order to keep the quotient unchanged, the divisor should be increased ().
10. arrange the following figures in descending order:
0.32 1.02 60% 1 - 12 0
( )
1 1. It is known that a× 120% = b÷c×= d÷, and a, b, c and d are arranged as () from big to small.
12. The sum of all the simplest true scores in fractions is ().
13. () ÷15 = = 24: () = ()% = () fold = () (decimal)
14. There are five numbers, and their average value is 138. From small to large, the average of the first three numbers is 127, the average of the last three numbers is 148, and the middle number is ().
15.