First Grade · Math · week 32

Order three objects by length

Order three objects by length from shortest to longest through direct comparison.

To put three objects in order by length, compare them directly, two at a time. Line up the ends and see which sticks out further. Do this a couple of times and the full order becomes clear.

A handy trick: find the shortest one first by comparing every pair, then find the longest; the middle one is whatever is left.

📋 For the teacher
Teach it (10–15 min):
  • Grab three real household objects, like spoons, shoes, or books, and physically line up ends to compare.
  • Model the two-step method: find the shortest first, then the longest, then the middle is automatic.
  • Ask your child to explain their order out loud, pointing at each comparison they made.
  • Mix in objects that are close in length to make the comparison a little trickier.
Talk about it:
  • How do you make sure a length comparison is fair?
  • What is a fast way to find the middle-length object?
  • Can you order three shoes in your house by length?

Mastery looks like: They order three objects by length correctly, using direct end-to-end comparison.

Common stumbles: Not lining up the starting ends evenly; guessing by eye instead of physically comparing.

Homework for this lessonType it, write it with a stylus, or print it for pencil & paper.open →
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