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Expanded Notation of 90 = (9 x 101) + (0 x 100)
You mean "What percentage is 90 million of 5 billion?" If so, [(90 x 10^6) x 100] / (5 x 10^9) = (9 x 10^9) / (5 x 10^9) = 9/5 = 1.8%
90 x 90 = 8,100
90 = (9 x 10) + (0 x 1)
The answer is 9 times 9 + x = 90 9+881 =90 81/9 =9 So 90 is greater than 9 by 9 times.