Which Maths program?

[DharmaDisciple]

I am looking for a maths program for my dd who is 10 (5th grade). She was at school last year and it seems that the math they taught her, then moved on to another topic meant that she has forgotten a lot of what has been taught eg she needs refreshing on long multiplication/division. She does not seem to have been taught any good techniques for mental arithmetic so I have been trying to help her with this, she gets stuck on word problems. Overall though her math level is average for her age I think.

I want to know what math program would be good for her. As we are in the UK, I am looking at Math Mammoth, MEP, Singapore, Math U See or possibly Horizons (Sonlight).

I had to say I tried a question on Math Mammoth (Multiplication 2) with her and I couldn't work out the answer (do they come with answer keys?)

Whatever I choose, I hope to start my son who is 6 on the same math program so he can fly and I can use the older resources with him when he reaches that age.

[jake&zaxmom]

I only have experience with Horizons. We LOVE, LOVE, LOVE Horizons math!! BUT it only goes through 6th grade so you would only be able to use it for two years then you would need to look for a different curriculum.
We've used it for 4 years.

My only complaint is the way the "worksheets" are presented. You have to look in the teaching guide that corresponds to that days' lesson, see if there is a worksheet associated with that lesson, then flip through the back of the teacher's book to find the worksheet (and it's a slightly different size than the lessons so it doesn't stack up nice and neat and the worksheets aren't perforated which bugs me )
I wish that they would organize it so that worksheets are just incorporated in the students' book directly following the lesson that they're supposed to do it with. Other than that...Horizons is awesome.