Preschool · Math · week 33

Count by matching: one plate per bear

Use one-to-one matching between two sets to decide if the sets are equal.

Matching means giving exactly one of something to each thing in another group.

If every teddy bear gets exactly one plate, with none left over, the two groups are equal.

📋 For the teacher
Teach it (10–15 min):
  • Matching is a powerful idea because it shows "equal" without even needing to count - lining things up one-to-one is enough.
  • Use it to check fairness in real life: "does everyone at the table have one spoon?"
  • Purposely try an unequal set sometimes (one extra or one missing) so your child sees what "not matching" looks like too.
  • After matching, count both groups anyway sometimes, to connect matching and counting as two ways to see the same idea.
Talk about it:
  • Does every bear have a plate, or is one missing?
  • How can you tell two groups are equal without counting them?
  • What happens if there are more bears than plates?

Mastery looks like: Child matches objects one-to-one between two sets and correctly says whether the groups are equal or not.

Common stumbles: Child gives some things more than one item while others get none, breaking the strict one-to-one rule.

See it visually

Interactive, spoken-aloud tools that show this idea in motion.

Counting & Ten-FramesCount objects in ten-frames and base-ten blocks, one tap at a time.try →
Homework for this lessonType it, write it with a stylus, or print it for pencil & paper.open →
Records attendance + 15 min of Math for this learner.
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