Maths LinkUp

LinkUp is a great resource from Triptico which I've used a few times in Maths. I want to start building a library of resources for it, so I've created a Google Word Doc to store my activities for later use, and to share with the department. Anyone can edit this, so please feel free to add your own. (I do have a backup!)

When you load up the program, either input your own categories and options, or skip to the next page and copy and paste into the input box. Then click next for the activity. I've used it as a timed activity, or for small groups to work on - it works great on the SmartBoard.

I like the way it doesn't show right or wrong, but gives a total number correct. This has prompted some vigorous debate about which "branch" needs to be moved.

The Unanswerable Question... Ooops

School exams have just taken place - delayed due to a bout of illness at the end of last term. In my year 5 exam, as a filler for those who finished early, I set the question:

Using the digits 1, 2, 3, 4, 5, 6, 7, 8, and 9 in order and the signs + and -, can you make 10?

To be fair to them, they had a good go, but no one managed to get the answer. It was only when we went through it that I realised it is superficially an impossible question. Using odds and evens, can you see why?

It is only when you combine two digits into one value that it is possible to make 10. One possible solution is:

12 + 3 - 4 - 5 - 6 - 7 + 8 + 9

"But why would you ask us a question that had no answer?" was the cry...

I smiled smugly in response!

This is a variation on a similar problem to make 100 using all digits in order.

Back from the "Blink"

2010 offically starts now for me. I have been unable to do pretty much anything for 2 weeks due to acute conjunctivitis. Looking at a computer screen was a definite no-no. However, my eye sight is returning, and I can start to fulfil one of my new year's resolutions; blog more!

For my first lesson back, made the most of the snow by getting year out on the football pitches to explore radius, diameter and circumference by pacing out circles in the snow. We will calculate our approximations for Pi on Friday, although, initially, they look quite accurate. Interestingly, they thought the smaller circles would be more accurate - can year 8s deal with percentage error? Probably!