4.385 x 107 in standard notation is 43,850,000
2.08 x 107 written in standard notation = 20,800,000
6.125 x 107 in standard notation is 61,250,000
50900000
3 x 107 is already in scientific notation (: 30,000,000 is the standard notation (if that's what you meant to ask)
8.34 X 10^7 = 83,400,000
Do you mean, what is the standard notation for 16000000? If so, then it is: 1.6 x 107
54,500,000 is the same as 5.45 x 107
45.4 million = 45,400,0004.54 x 107
7.003 x 107
42.78 million is: 4.278 x 107
30 million:Standard notation = 30,000,000Scientific notation = 3 x 107