The twenty frame has two rows with ten spaces each.
Place the first number and fill the top row up to ten.
The remaining dots go into the second row.
That way you see crossing the ten right in front of you.
The filled-in example next to it shows the answer.
Example
- 13
- 13
What does this exercise practice?
The twenty frame shows crossing the ten as filling up the first row and supports calculating with pictures.
Common pitfalls
The top row fills up first. Only when ten are there does the second row begin.
How to practice at home
Use twenty counters in two rows and, when calculating, always fill the first row first.
Related: Crossing ten, Make ten