With the limited amount of time in the school year, it was helpful to receive a pacing guide that taught some units every other year. While that helps with the time element, it is difficult for teachers to really learn the curriculum when they're teaching it every other year. What if certain units were assigned by grade level? For instance second and fourth grade teach 2-D geometry and third and fifth teach 3-D every year? That way the grade level doesn't flip back and forth between units. Is there significant 2-D geometry taught at fifth grade that is not taught at 4th? I know the 2-D geometry taught at fifth grade is important but could it be skipped to create a better teaching schedule.