Let us represent one gallon as 1
Then 1% of 1 is 1/100
And so 10% would be 10/100 = 1/10
Hence 10% of one gallon is (1/10)th of a gallon
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1.6 cups is ten percent of a gallon
Divide it by 10
10% of 16 = 1.6
200000000. Just drop one zero.ten percent of 1 billion PLUS ten percent of 1 billion = ten percent of 2 billion10% of a billion is 100 million. You figure it out2,000,000,000 is 2 billion. Move the decimal place one spot to the left to get 10 percent of a number. That means that 10 persent of 2 billion is 200,000,000. This is 200 million.
20% is one fifth. To divide by 5 easily, double the figure then divide by 10: 74.58 x 2 = 149.16, divided by 10 = 14.916.