The 20 Track provides children with an introduction to the number line and gives them the opportunity to discover addition and subtraction facts for numbers 1 to 20. Children can also see how the structure of the facts they learned about from numbers 1 to 10 have a similar structure in the numbers 11 to 20.
The 20-Track is used to teach:
- Concept of teen numbers using a linear representation
- Place value of teen numbers (one 10 block and another block)
- Addition and subtraction within 20
- Fluency with adding 10 and 9 to any number
- Fluency with making a 10 to add two numbers