Congratulations on your baby girl! How are the big brothers adjusting?
If all you want are word problems you can solve using algebra, then Singapore Challenging Word Problems should be sufficient. Even though they want the student to solve the problem without using and algebra, you can go ahead and solve them using algebra. I think any book from the 4th level up should do.
Talking about math, I got the next level of Zaccaro (for elementary and middle school students) and cannot wait to use it. I waited too long with the previous level and before I knew it most of the material was way too easy for DS6. The middle school level includes equations with 2 variables, cosine, acceleration, slope of the line of tangent, Venn Diagrams, and other really cool things.
