Edit 2021: Here I have a collection of links I originally brought together for Thomas. I have gone through and taken out the links that no longer work.

Math worksheet – not just decimals here also subtraction, addition multiplication, and some playschool (or kindergarden as American site

PDF’s on Fractions

Below are some links to some PDF from work sheet fun. should you want more they have a wide range available.
Fraction Worksheets
1st sheet Fraction introduction
2nd sheet Fraction Introduction
Equivalent Fractions 
Fraction worksheet

Jumpstart – fraction into different shapes
Math Aids – loads of different fraction sheets