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Lengths: Long and Short
An introduction to comparing lengths as long and short for kindergarten learners, using pictures and everyday objects to build early measurement and ordering skills.
Comparing Two Objects
Look at the two pencils below. They start at the same place on the left. The blue pencil reaches much farther to the right than the green pencil, so the blue pencil is long and the green pencil is short.
Notice the dashed line marking where both pencils begin. Without lining up the starting points, it would be hard to tell which one is really longer. This is the same idea used when comparing tall and short objects, except length compares how far something stretches sideways instead of how high it stands.
Comparing More Than Two Objects
Sometimes there are three or more objects to compare, not just two. In that case, we order them from shortest to longest, or longest to shortest.
To order objects by length, always keep one end lined up in the same place. Then just look at which object stretches the least (shortest), which stretches a middle amount (medium), and which stretches the most (longest).
Long and Short in Everyday Life
Long and short comparisons show up everywhere: a long snake versus a short worm, a long ruler versus a short crayon, or a long hallway versus a short hallway. Practicing with real objects at home, such as spoons, shoelaces, or crayons, helps make the idea of long and short concrete before moving on to numbers and units.
Length is just one way to describe an object's size. Kindergarten also introduces comparing width as wide and narrow, since an object can be long and narrow, or short and wide, at the same time.
Checking Length Without a Ruler
Before learning to measure with numbers, young learners compare length directly by placing objects side by side, or indirectly by using another object as a go-between. For example, if a piece of string is longer than a book, and that same book is longer than a pencil, then the string must be longer than the pencil too. This hands-on approach connects closely to measuring using objects, where everyday items are used as simple tools to compare and describe size.
Tips for Practicing Long and Short
When working through long and short worksheets, remind learners to always start by lining up one end of each object. Encourage them to point to the end of each object as they compare, and to say out loud which one is long and which one is short. This builds confidence before comparing three or more objects and ordering them from shortest to longest.