Przykład:
0,(15) zamień na liczbę wymierną
0,151515....=x|*100
15,1515....=100x
15+0,1515....=100x
15+x=100x
15=99x
x=
Tym samym sposobem zamień:
0,2(43); 1,4(5); -2,34(5)
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0,2(43)=0,2+0,0(43)
0,04343...=x |*10
0,4343...=10x |*100
43,4343...=1000x
43+10x=1000x
43=990x
1,4(5)
1,4(5)=1,4+0,0(5)
0,0555...=x |*10
0,555...=10x |*10
5,555...=100x
5+10x=100x
5=90x
-2,34(5)
-2,34(5)=-2,34-0,00(5)
0,00555...=x |*100
0,555...=100x |10
5,555...=1000x
5+100x=1000x
5=900x
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