To help you index:

Conclude by giving your students these challenges:

- Cuisenaire Counting by NRICH
- Robert's Spreadsheet by NRICH
- Peaches in General by NRICH
- Perimeter Possibilities by NRICH
- Two Trees

To help you index:

Conclude by giving your students these challenges:

- Cuisenaire Counting by NRICH
- Robert's Spreadsheet by NRICH
- Peaches in General by NRICH
- Perimeter Possibilities by NRICH
- Two Trees