Steps are::
1) 4.5 = 45/10. (removing decimal from the figure.)
2) 45/10 = 9/2. (divide numerator and denominator by 5.)
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.45 = 9/20
It is: 12/45 = 4/15 as a fraction in its lowest terms
15/45 = 1/3
0.45 is fourty-five hundreds. Written as a fraction it is 45/100. In lowest terms it is 9/20.
450% = 4.5 = 45/10 = 9/2 = 41/2