Line it up, then compare
Give a group five classroom objects and ask them to line them up from shortest to longest. Watch whether they line up the starting ends. That one habit, a shared starting line, is the root of using a ruler correctly later.
Why it works: the U.S. Department of Education's guide for teaching elementary math recommends moving from hands-on objects to drawings to numbers.
Try it withUsing Length to Order Objects WorksheetWorksheetsOpen it →























