Well, honey, technically speaking, 2 is not the same as 2.0. One is an integer and the other is a decimal. But hey, they both represent the same value, so in the grand scheme of things, does it really matter? Just don't go telling your math teacher I said that.
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Yes 2/10 is equal to 20/100
20 x 2 = 40
45 / 20 is equal to 2.25 or 2 1/4
That is correct.
As a decimal: 20.0 As an improper fraction: 20/1 As a product of its prime factors: 2*2*5 = 20 In scientific notation: 2.0*10^1 As a Roman numeral: XX = 20