Excuse me, but I'm forgetting who out there is homeschooling and who is using Singapore math.

I'm looking at supplementing my 1st grader in math a bit, who is learning very little at school this year, with 2nd grade Singapore math. He breezed through the placement tests for 2nd grade. He could most likely go higher, but I don't want to leave any gaps. He isn't necessarily familiar with all the notation, etc even if he understands conceptually. I think if we have it around the house, he'll learn it by osmosis and we can skip sections if needed.

ANYWAY - to the point. What books/workbooks do I <NEED> to have to get by with the Singapore series? I do have a BS in math, so I don't feel like I need a lot for myself to help him. But enough for him to be able to dive in. Is the textbook and the workbook enough?

Thanks for any advice!