Kindergarten · Math · week 30

Longer or shorter?

Directly compare the length of two objects and describe which is longer, shorter, or if they are the same length.

Some things are longer, some are shorter. To compare fairly, line up two objects at the same starting edge, like both starting at a wall.

Whichever object sticks out further is longer. If they end at exactly the same spot, they are the same length.

📋 For the teacher
Teach it (10–15 min):
  • Always line objects up at the same starting edge. This is the number one rule for a fair comparison.
  • Use the words longer, shorter, and the same length often during the day.
  • Let your child physically place objects side by side rather than just guessing by eye.
  • Try surprising comparisons. Sometimes a big toy is shorter than a small one.
Talk about it:
  • Why do you need to line objects up at the same edge to compare them fairly?
  • Can you find something longer than your shoe? Shorter than your shoe?
  • What are two things in our home that are the same length?

Mastery looks like: They fairly compare two objects by lining up one edge and correctly say which is longer, shorter, or the same.

Common stumbles: Comparing objects without lining up a starting edge; guessing length by overall size instead of true length.

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