Answer:
300,000,000+9,000,000+90,000+9,000+900+90
Step-by-step explanation:
309,099,990
As per the international system of numeration the numerals are divided as per 100 million, 10 million , million,100 thousand , 10 thousand, thousand, hundred , tens ,ones.
309,099,990
After 3, count the number of digits
Number of digits are=9 digits
Multiply 3 by\(10^{9}\)
similarly , after 9
To convert into expanded form, repeat the process to ones digit
309,099,990= 33×\(10^{8}\)+9×\(10^{6}\)+9×\(10^{4}\)+9×\(10^{3}\)+9×\(10^{2}\)+0
Hence,the correct answer is 300,000,000+9,000,000
+90,000+9,000+900+90
