Increasing rigor is not the same as making things harder. Rigor should be the buzz word we use in conjunction with thinking deeper, communicating more effectively and raising expectations.
I have personally applied this flip chart with 4th and 5th grade students (alongside a hand drawn reference poster with the same terminology and equation examples). As a fourth grade teacher this ActivInspire flip chart is one approach to expecting more from strong mathematicians as well as a way to inform all students about how equations are meant to be articulated for other mathematicians to check. As a fifth grade teacher I would use this flip chart as a way to indicate expectations for all equation writing.
I am a big proponent for "Release of Responsibility", which is how this flip chart is designed. Although not address in this flip char, Order of Operations may play a role in this lesson.
Please redesign for yourself.
A General Lesson Guide Possiblity:
Page 1 - Learning Goal
(Though I suggest inserting an engaging image related to the goal)
Page 2 - Vocabulary
Page 3 and 4 - Model writing vertically and separating calculations
(equation under smallest yellow rectangle)
Page 5 - Collaborate with students writing vertically and separating calculations
Page 6 - Independent Practice or Student Collaborative Practice
(equation under smallest yellow rectangles)
Page 7 - Learning Goal and Vocabulary Review
Page 8 and 9 - Collaborate with students, independent practice or student collaborative practice writing equations from story problem situations
Additional Algebra Practice
Page 10 and 11 - Revisit, Problem Solve, Apply, Communicate
(There are four box of challenges on each page that connect to the algebraic concepts likely practiced pages 1 - 9. Page 11 is slightly more challenging than page 10.)