The answer has 3 parts assuming you are applying as an FSW candidate from outside Canada. If not, stop reading and ignore the rest. :-[
1. FSW point scale http://www.cic.gc.ca/english/resources/tools/perm/econ/fsw/work.asp
Under this you will get 13 points on 100 for experience between 4 and 5 years.
2. EE Skills Transferability scale http://www.cic.gc.ca/english/department/mi/express-entry.asp (search for "Foreign work experience")
Under this, your work experience can be combined with language proficiency and/or Canadian work experience to net you a maximum of 50 points on 1200 scale depending on the nature of your experience. The maximum points are netted when applicant has 3 years of work experience and those years can be across multiple jobs but within the last 10 years, in the same NOC and full time paid employment.
3. EE - Minimum work experience requirement http://www.cic.gc.ca/english/resources/tools/perm/econ/fsw/minimum.asp
Under this, you will qulaify easily because this requires demonstration of only 1 year of continuous full-time paid employment over the last 10 years.
Having said all that, I recommend that you input your work experience as 4 years and 11 months as of now (which is the truth) and ensure that your primary NOC and the NOC for these jobs is the same (which I guess is also the truth). As for the 8 months gap, be honest and show it as Unemployed. Misrepresentation is a big offence and you don't want to attract that attention from CIC.
As I've explained above, you will still get the highest points everywhere else except on the 67 scale (where you will get the second highest points - 13) but there the highest score (15) will accrue only after 6 years of experience (continuous or otherwise; and over same/multiple NOCs provided they are 0,A or B) over the last 10 years.
Hope this helps. All the best!