42,768,321,561,100 =
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321 in expanded form = (3 x 100) + (2 x 10) + (1 x 1)
300+20+1
321 = (3 x 100) + (2 x 10) + (1 x 1)
To convert 3.21 to a fraction, we can write it as 3 + 0.21. Since 0.21 can be written as 21/100, the fraction form of 3.21 in simplest form is 321/100.
3.21 = 321/100. That is the number in the form of the simplest fraction though I would not say that is a simpler form than 3.21!