This gives a broad outline for you - Y1 and Y2 make up Key Stage 1, so bear in mind this is talking about by the end of Y2 what they hope for. You can use the links at the side to look at the different areas of Maths. The "attainment targets" break it down more for age - as a rough guide they hope for a Level 1 in year 1 (but this doesn't then entirely correspond up the school years, confusingly!) Changes are planned though for Sept 2014!
Shapes, 3d shapes, number bonds up to ten and 20, half and doubles, tens and units, understanding some of the maths symbols ( +,-, =), understand and work with 100 number squares, count in 2s, in 3s, in 10s (from any number - ie 3-13-23-33-43). Spot simple patterns.