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[tex]10^{9}[/tex]
similarly , after 9
To convert into expanded form, repeat the process to ones digit
309,099,990= 33×[tex]10^{8}[/tex]+9×[tex]10^{6}[/tex]+9×[tex]10^{4}[/tex]+9×[tex]10^{3}[/tex]+9×[tex]10^{2}[/tex]+0
Hence,the correct answer is 300,000,000+9,000,000
+90,000+9,000+900+90
