The cache name not only highlights the need for cachers to apply the skills of mathematics to this cache but also highlights the number of finely tuned senses you or your group will need to use if you are to find and log it. You may need up to an hour and a half to retrieve the cache and return to your starting point.
The inspiration for this cache was a multi cache we did in the summer in Spain placed by Xarifa, whose caches contributed significantly to a great holiday. We pass on our thanks to her.
This cache will take you to two historically significant sites, the famous Stanley Ferry Aqueduct (see link) and the Newland estate (see link), which has a long history dating back to the Bronze Age.
To log this cache you will need to visit 3 waypoints where you will answer a total of seven different questions. These will give you the numbers to replace the letters A to G in the sums below. Correctly doing these "sums" will give you the co-ordinates for the 4th waypoint, which is NEARLY at the cache location.
The series of traditional caches “Sum practice” have been published at the same time to simply give you “sum practice” in the sort of maths you need to solve this one. That series does not directly link in to this cache except the sums may give you a slight pointer, if you are struggling to find all the letters to do the main sum below. You would be advised to take a calculator with you on your walk to work out the final co-ordinates.
The co-ordinates at the top of the page are the suggested parking point. Watch little ones carefully for the first part of your quest as you start off alongside a busy road without a proper pavement. The rest of the route is mainly paths in the woods, which can get muddy at times, so walking boots are recommended.
Go to WP1, taking care to get there along the side of the road. N53 42.178 W001 27.839
Question A – When was this bridge opened? Which number appears twice in the year? = A
Question B - How many letters in total does the famous Rt. Hon. Harold Wilson have after his name here? = B
Question C - Stand with your back to the plaque. If a “span” is one length of one cable between two electricity pylons, how many “spans” can you see from where you are standing? Do not include telephone cables. What is the lowest prime number which is a factor of your answer (Remember: one is not a prime number)? = C
Still take care. Follow the road across the next bridge (with traffic lights), go down the steps and go to WP2
N53 42.167 W001 27.722
Question D – You will already have had a good view of the arched aqueduct from WP1. This is thought to be the largest cast iron aqueduct IN THE WORLD and is said to have inspired the design of the Sydney Harbour Bridge. Including the little ones at the ends, how many red upright poles are there in total supporting the arches? Divide this number by 10 and then subtract 1 = D
Question E – Listen carefully. How many different live animals (including birds) can you hear at this location? = E
Do not cross the river. Instead, now enjoy the walk through the trees to WP 3 N53 41.850 W001 26.863 (picking up the “Sum practice” caches along the way, if you don’t already have them)
You are now standing amongst the derelict buildings of the Newlands estate, which can be traced back through documents which have survived and span over 900 years. Occupation of the site dates back at least to the Bronze Age and it is believed to have been the site of a Roman villa or camp. The estate belonged to a community of Knights Templar up to 1256 when it was transferred to the Knights of St John of Jerusalem, the Knights Hospitallers. In 1740 Newlands Hall was built with 54 rooms and was one of the grandest buildings in the area, although the hall itself was largely demolished in 1917. This waypoint has you looking at the old stable block, which was actually lived in until the 1960s.
Question F – How many arches can you see at ground floor level on the front of the stable block through the overgrown shrubbery? = F
Question G – With such a long history it is not surprising that this location allows people to really imagine themselves as part of history. A surprisingly large number of people are able to experience a sixth sense and get a real feel for what life was like in times gone by. Can you immerse yourself in the history of this place? At this waypoint, just close your eyes for a little while and imagine the Knights Templar returning after a long journey from a visit to a neighbouring estate. How many knights can you see arriving home on horseback? = G
Now you have all the answers you need to do the sums below, so find a place to sit and work it out. The following co-ordinates should take you to WP4, which offers you a decent view of countryside, farmland, the city of Wakefield, Emley Moor tower and ....well perhaps another feature which wasn’t part of the view at the time of the Knights Templar! 
Once you have enjoyed the view, LOOK DOWN AT THE ARROW on the stone slab. Go in the direction indicated to the first tree, approximately 30 paces away and behind it you should find a small clip lock container in a camo bag as sum reward for all your efforts.
You can follow your GPS to return the way you came ( latching on to the cache Sum practice 3 will get you back on track) or you could alternatively go to the main road via Altnew 3 and dead or Alive to complete a longer circular walk. This circular way however would take you mainly via the road back to Stanley Ferry, parts of which have no pavement.
NHi.