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5/9x3/15=1/9-skróć 5 z 15 przez 5; 3 z 9 przez 3!
5/9:2=5/9:2/1=5/9x1/2=5/18
1 5/8+1/2+2 3/10=1 5/8+4/8+2 3/10=1 9/8+2 3/10=1 90/80+2 24/80=3 114/80=
=4 24/80=4 12/40=4 6/20=4 3/10
1/2x3=1/2x3/1=3/2=1 1/2
1 2/5:4/7=12/5:4/7=12/5x7/4=21/5=4 1/5