Summary

1. Pupils use the Enrich school orienteering map to locate their starting point and specific control points.
2. At each control point, pupils fill in the 3^rd and 4^th number from the control marker on their Activity Sheet.
3. They combine these two numbers to make a two-digit number.
4. They then add and subtract either 17, 18 or 19 from the two-digit number that they have made and record their answer on their Activity Sheet.