Teaching with the 20-Track
The 20 Track provides the children with an introduction to the number line and affords the child the opportunity to discover addition facts for numbers 1 to 20. Children can also see how the structure of the addition facts they learned about numbers 1 to 10 has a similar structure in the numbers 11 to 20. The number track also helps in grasping the bridging facts.
The 20-Track is used to teach:
- A measurement model: a linear representation of teen numbers
- That the teen numbers are built from a 10 block and another block
- Children can test that two addends ,14 and 3, do actually measure 17 in the number track
- The bridging facts.