Kindergarten · Math · week 25

Count all the way to 50

Count forward by ones from 1 to 50, correctly saying the decade transitions, such as 29 to 30 and 39 to 40.

You know your teens now. The twenties, thirties, and forties work almost the same way. After 29 comes 30, a whole new decade word.

The tricky part is the change: 28, 29, then 30, not twenty-ten. Listen carefully at each new decade.

📋 For the teacher
Teach it (10–15 min):
  • Practice counting to 50 daily. Slow down right at each decade change (29-30, 39-40).
  • If they say twenty-ten instead of thirty, gently model the correct word.
  • Use a hundred chart if you have one. The rows make each decade visible.
  • Break it into chunks if 50 feels long: count to 20, then 20 to 50, then combine.
Talk about it:
  • Which decade change is trickiest for you: 29-30, 39-40, or 49-50?
  • How is counting in the thirties like counting in the twenties?
  • Can you count all the way to 50 without stopping?

Mastery looks like: They count from 1 to 50 by ones, correctly transitioning through each new decade.

Common stumbles: Saying twenty-ten or similar instead of the correct decade word; losing the sequence right after a decade change.

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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