29.8*107 = 298,000,000 or 298 million.
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53,800,000
2.3*10 to the seventh power
10 to the seventh power - or 10,000,000. When multiplying numbers with exponents - you add the exponents together.
32.5*10-7 = 0.00000325
5.20 x 10-7 = 0.00000052