It should have said this:
Up to 100 days, the 10 extra days will be disregarded.
If you're between 101 and 179 days, this is what the UKBA will consider:
requirements are met and
a) you have demonstrated links with the UK through presence of family,
and established home and a substantial part of your estate.
See "Guide and Booklet AN"
You don't need to show that your future intentions are to remain in the UK, as such, but you need to show that your family and home are here, as quoted above from the guidance.
Hope this helps.