Tabitha has 25-8 = <<25-8=17>>17 dollars after giving some to her mom.
Tabitha has 17/2 = <<17/2=8.5>>8.5 dollars left after putting some in a money market.
The 5 items Tabitha buys totals out to 5*0.5 = <<5*0.5=2.50>>2.50 dollars.
Tabitha has 8.5-2.5 = <<8.5-2.5=6>>6 dollars left.
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