One more is still just the next number, even past ten.
Step 1: Let's Learn
Read it, or press Listen and follow the words.
The tricky one is 19. One more than 19 is 20, not "ten ten".
Why 19 is the hard one
Going from 19 to 20 changes both digits at once. The ones roll back to zero and the tens go up. Every other step changes only one digit.
It happens at every ten
The same jolt comes at 29, 39, 49. Once you know where the hard step is, you can slow down exactly there.
Step 2: Try It Yourself
Tap and try it out.
Step 3: Watch an Example
One step at a time.
Watch Ben Cross Twenty
Ben is on 19 and needs one more.
- Step 1
He does not go back to the start.
Step 4: Your Turn
Practice makes it stick.
Marbles
Problem 1 of 1
Leo has 17 marbles. He finds 1 more. How many now?
marbles
Just Past Ten
Do not go back to one.
1 of 3
One more than 13?
2 of 3
One less than 16?
3 of 3
One more than 19?
Step 5: Quick Check
Show what you know.
Question 1 of 2
One more than 11?
Question 2 of 2
One less than 20?
What You Learned
- One more is the next number, even past ten.
- One less is the number before.
- After 19 comes 20.