Trey has 7 times as many turtles as Kris. Kris has 1/4 as many turtles as Kristen has. How many more turtles does Trey have than Kristen, if Kristen has 12?
Kris has 12/4 = <T>divide(12, 4)=3.0 turtles.
Trey has 3*7 = <T>multiply(3, 7)=21 turtles.
Trey has 21-12 = <T>subtract(21, 12)=9 more turtles than Kristen
