Join us on this flipped math lesson for CCLS 4.NF.A.1 where we work through a problem that was inspired by a released common core exam item where we learn to write a fraction that is equivalent to a given diagram. This lesson answers the question: How can we model fractions? How can I write a fraction? How can I write a fraction that represents a shaded region? How do I reduce fractions? Our lessons are perfect for flipped classroom math teachers and students and for warm-up and exit ticket activities . This lesson is aligned with the 4thgrade common core math learning standards for math and the SAT math curriculum as well. Be sure to join our mailing list at http://www.mashupmath.com