2×1/3=2/3; 2/3÷4=1/6; 1/6×3=1/2
1/2×5= 5/2; 5/2÷10=1/4; 1/4×4/5= 1/5; 1/5÷1/15=3
2/3÷2/3= 1; 1×4/9=4/9; 4/9÷2=2/9; 2/9×18=4
6×1/3=2; 2×1/3=2/3; 2/3×1/3= 2/9; 2/9÷1/3=2/3