New math unit

Today we began Unit 9 - Perimeter, Area, and Volume in math.  The students are required to write down the formula they need each time they calculate perimeter, include the units of measure, keep equal signs underneath each other, and SHOW ALL THEIR WORK.  When they are drawing figures, they must use a ruler.  When they are measuring figures, they must measure to the nearest mm.  They learned today not to assume that diagonal lines on grid paper are the same measurement as if they followed the squares on the page.  They must measure diagonal sides on parallelograms, rhombuses, etc.