Question 1103428

a)  0.4321 

Notice that if you multiply by 10000, the decimal point will move 4 places to the right, making 0.4321 into an integer.  We then just write the 10000 as the denominator:
0.4321 = 4321/10000
Now we should check if the fraction can be reduced.  Since there are
no common factors (4321=29*149 and 10000 = (2*5)^4)  the fraction is already reduced.  
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Ans (a): {{{ highlight(4321/10000) }}}

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You can use a very similar approach for the other two problems.