2 1/10:
= 2 + (1 ÷ 10)
= 2 + 0.10
= 2.1
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2/5 multiply times 2(because .1=1/10). that equals 4/10 in decimal form that is .4(again, because .1=1/10).
same as 1/10 = .1
0.5 = 1/2
You can, but only if the decimal is 1.0+. okay, say your decimal is 1.2, then you put the 2 over 10 and keep the one as a whole so it looks like 1 2/10 or 1 1/5
1/5 = 2/10 = 0.2