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 decimals
underline indicates repeating decimals
half = 0.5 third = 0.3 quarter = 0.25 fifth = 0.2 sixth = 0.16 seventh =  0.142857
two thirds = 0.6 2/4 = half two fifths = 0.4 2/6 = third 2/7 =  0.285714
three quarters = 0.75 three fifths = 0.6 3/6 = half 3/7 =  0.428571
four fifths = 0.8 4/6 = two thirds 4/7 =  0.571428
five sixths = 0.83 5/7 =  0.714285
6/7 =  0.857142

underline indicates repeating decimals
eighth = 0.125 ninth = 0.1 tenth = 0.1 eleventh = 0.09 twelfth = 0.083
2/8 = quarter 2/9 = 0.2 2/10 = fifth 2/11 = 0.18 2/12 = sixth
3/8 = 0.375 3/9 = third 3/10 = 0.3 3/11 = 0.27 3/12 = quarter
4/8 = half 4/9 = 0.4 4/10 = two fifths 4/11 = 0.36 4/12 = third
5/8 = 0.625 5/9 = 0.5 5/10 = half 5/11 = 0.45 5/12 = .416
6/8 = three quarters 6/9 = two thirds 6/10 = three fifths 6/11 = 0.54 6/12 = half
7/8 = 0.875 7/9 = 0.7 7/10 = 0.7 7/11 = 0.63 7/12 = 0.583
8/9 = 0.8 8/10 = four fifths 8/11 = 0.72 8/12 = two thirds
9/10 = 0.9 9/11 = 0.81 9/12 = three quarters
10/11 = 0.90 10/12 = five sixths
11/12 = 0.916