First of all....your kid descriptions sound a lot like mine. My son (oldest, 4th grade, pro procrastinator) likes math u see, but my daughter (2nd grade, loves worksheets) hates it. I won't even get into the other 2. My daughter prefers Math Mammoth. I have tried everything (MUS, Math Mammoth, iXL, Time4Learning, Teaching Textbooks, Horizons) with my son and have ultimately gone back to MUS. I initially left Math U See because I thought it was leaving huge gaps in his math skills. However, I have gone back to it for mastery and use other things like iPad Math Apps, ST Math and/or Time 4 Learning for more math review. ST Math is really awesome - visual math program with group buy price on homeschool buyers coop. Back to Math U See though. I usually have him do the A, D, and G page. Sometimes we do the G together. MUS recommends that you do all the D, E, F Systematic Review pages, but since we are kinda trying to catch up due to all our jumping around we have not been doing all of them. Hope this helps. I'd love to hear any tricks anyone has for a procrastinator that can make math take up the entire day!!!!!