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: going from real objects to pictures to symbols is a core recommendation of the U.S. Department of Education's elementary math guide.
Try it withUsing Length to Order Objects WorksheetWorksheetsOpen it →























