Addition Number Locks

Unlock addition facts to 20 with this set of innovative self-correcting locks and keys.

• Choose a key and solve one of the 2 equations printed on it (front and back) then find the lock with the answer.
• If it is correct the key will turn and the lock will open.

Each set includes 20 locks and 39 keys.

Size: locks 8cm.

See Delivery & Returns page for further information.