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NUMBEROCK
Adding and Subtracting Fractions
In a future time, when AI robots have taken over running pizzerias on a planet orbiting Alpha Centauri, the robot Zigon takes orders and then adds and subtracts fractions before the Pizzamatic-5000 serves up large pepperoni and cheese...
Khan Academy
Khan Academy: Fraction Word Problem: Spider Eyes
Sal Khan solves a fraction word problem about spider eyes. The fractions have common denominators.
Khan Academy
Khan Academy: Fraction Word Problem: Pizza
Sal Khan uses fraction models to figure out what fraction of a pizza is left.