4.8 = 48/10 = 24/5 or 44/5 = 8 4/5
0.107 = 107/1000 which cannot be simplified further.
3.74 is 3 + 74/100. To simplify 74/100, find the Greatest Common Factor (GCF) between 74 and 100, then divide both of these by the GCF to get the new numerator and denominator. The GCF is 2, so...
0.495 = 495/1000 = 99/200
0.248 = 248/1,000 = (248/8)/(1,000/8) = 31/125
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