You either use a calculator, or do it arithmetically by dividing 4 by 1
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4/10 as a decimal is 0.4
4/5 as a decimal is 0.8
2/5 multiply times 2(because .1=1/10). that equals 4/10 in decimal form that is .4(again, because .1=1/10).
1.25
It is: 4/2 = 2/1 = 2.0 as a decimal but 2/4 = 1/2 = 0.5 as a decimal