How many malls are in the dallas - ft.worth metroplex?

I do not know. The Dallas area, according to the Travel Channel, has more shopping per capita than any other city in the United States. So, that means that there is quite a bit of shopping in the Dallas/Fort Worth Metroplex. Here are the malls that I recommend, in order:
1. The Galleria, Dallas
2. Stonebriar Centre, Frisco
3. Northpark Mall, Dallas
4. Grapevine Mills Mall, Grapevine
These are all of the top malls in Dallas that I have been to. The Galleria has a lot of high-end stores such as Saks Fifth Avenue and Nordstrom. But it also has 'regular' stores. It also has an ice rink and a movie theater. Stonebriar Centre is a giant mall with a lot of good stores. There is a variety of stores such as Nordstrom, Macy's, Abercrombie and Fitch, etc. Stonebriar has an AMC 24 movie theater on it's third level as well as an ice rink on it first level. The great thing about Stonebriar is that surrounding the mall is a lot of shopping centers with all the stores not in the mall (pretty much) as well as restaurants that are awesome. There are also shopping centers such as these in Dallas (around the Galleria) but not as many or as close. The Northpark Mall is even more high-end than the Galleria. Northpark Mall includes stores such as Barney's New York, Calvin Klein Underwear, Georgio Armani, Hugo Boss, Diesel, Kenneth Cole New York, Juicy Couture, Ralph Lauren, etc. A plus with this mall is that there is plenty of sculptures by world-renowned sculptors and artists placed throughout the mall to gaze upon. Northpark has an AMC 15. Grapevine Mills Mall has a lot of outlet stores in it. The mall has 1.6 million square feet. In addition, it has a rainforest cafe, an AMC theater, lunar mini golf, and a Chuck E. Cheese. These are the best malls in Dallas. These do not include the many shopping centers, only malls. Hope this information helps. God Bless!*

Way too many.
Due to the heat and lack of natural beauty, shopping is the number 1 past time in the metroplex.

I know of 7; there might be more.

lets see, theres so many, galleria, valley view, stonebriar, willow bend, irving mall, shops at legacy, richardson square, grapevine mills, north park, hm

17. There's NorthPark, Galleria Dallas, Valley View, Collin Creek, Willow Bend, Stonebriar, Vista Ridge, Golden Triangle, Irving Mall, Town East, Redbird, Grapevine Mills, Parks Mall, Six Flags, Northeast, Ridgemar, Hulen

there are too many to go to in a week, and larry didn't mention any of the outlet malls

Too many to count. There are malls virtually everywhere.