Bruch	Dezimal	Prozent	Bruch	Dezimal	Prozent
1/2	0.5	50%	1/8	0.125	12.5%
1/3	0.333...	33.33%	3/8	0.375	37.5%
2/3	0.666...	66.67%	5/8	0.625	62.5%
1/4	0.25	25%	7/8	0.875	87.5%
3/4	0.75	75%	1/10	0.1	10%
1/5	0.2	20%	1/16	0.0625	6.25%

Addition/Subtraktion:

a/b ± c/d = (ad ± bc) / bd

Beispiel: 1/2 + 1/3 = (1×3 + 1×2) / (2×3) = 5/6

Multiplikation:

a/b × c/d = (a×c) / (b×d)

Beispiel: 2/3 × 3/4 = 6/12 = 1/2

Division:

a/b ÷ c/d = a/b × d/c = (a×d) / (b×c)

Beispiel: 1/2 ÷ 1/4 = 1/2 × 4/1 = 4/2 = 2