Concept 1 of 6
Adding Within 20: Count On
Today's big idea
To add, start at the bigger number and count on.
8 + 5: hold 8, then hop on 9, 10, 11, 12, 13.
How it works
👀 What's going on?
You have 8 stickers and get 5 more. How many now?
💡 Here's the trick
To add, start at the bigger number and count on. Start at 8 and count 5 more.
8 + 5: hold 8, then count 9, 10, 11, 12, 13. You land on 13.
✍️ Try it
Add 6 + 4. Start at 6 and count on 4: 7, 8, 9, 10.
⚠️ Watch out
Always start from the bigger number, so there is less to count.
Watch me solve one
Quanta solves it
“Watch how I think through one of these — then you try.”
THE PROBLEM
“What is 9 + 3?”
- 1
Start at the bigger number
9 is bigger than 3, so hold 9. ✋
- 2
Count on three
9 → 10 → 11 → 12
- 3
Answer ✓
9 + 3 = 12
Now you try one — same steps, different story 👇
See it in action
⚡ Time to play!
Start at 8 (the bigger number) and tap to count on 5.
8 + 5
8
counted 0 of 5
Quick check
✅ VERIFICATION
What is 7 + 6?
⚡ Finish the activity above first to answer.
Keep going!
Up next: Doubles & Near-Doubles
A near-double is one more than a double.