interactive fractions
a1 a2 a3 a4
b1 b2 b3 b4
c1 c2 c3 c4
d1 d2 d3 d4
what fractions look like types of fractions operations 

Fractions and percentages
underline indicates repeating decimals
half = 50% third = 33.3% quarter = 25% fifth = 20% sixth = 16.6% seventh =  14.285714%
two thirds = 66.6% 2/4 = half two fifths = 40% 2/6 = third 2/7 =  28.571428%
three quarters = 75% three fifths = 60% 3/6 = half 3/7 =  42.857142%
four fifths = 80% 4/6 = two thirds 4/7 =  57.142857%
five sixths = 83.3% 5/7 =  71.428571%
6/7 =  85.714285%

underline indicates repeating decimals
eighth = 12.5% ninth = 11.1% tenth = 10% eleventh = 9.09% twelfth = 8.3%
2/8 = quarter 2/9 = 22.2% 2/10 = fifth 2/11 = 18.18% 2/12 = sixth
3/8 = 37.5% 3/9 = third 3/10 = 30% 3/11 = 27.27% 3/12 = quarter
4/8 = half 4/9 = 44.4% 4/10 = two fifths 4/11 = 36.36% 4/12 = third
5/8 = 62.5% 5/9 = 55.5% 5/10 = half 5/11 = 45.45% 5/12 = 41.6%
6/8 = three quarters 6/9 = two thirds 6/10 = three fifths 6/11 = 54.54% 6/12 = half
7/8 = 87.5% 7/9 = 77.7% 7/10 = 70% 7/11 = 63.63% 7/12 = 58.3%
8/9 = 88.8% 8/10 = four fifths 8/11 = 72.72% 8/12 = two thirds
9/10 = 90% 9/11 = 81.81% 9/12 = three quarters
10/11 = 90.90% 10/12 = five sixths
11/12 = 91.6%