Answer:
abs(-1/4), abs(-0.5), abs(6/10), abs(6.25).
Explanation:
abs(-1/4)=1/4=0.25
abs(6/10)=6/10=3/5=0.6
abs(6.25)=6.25
abs(-0.5)=0.5
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abs(-1/4)=0.25 is the smallest, then comes abs(-0.5)=0.5, next comes abs(6/10), finally, comes abs(6.25).